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HTML 

              
                <!-- Sweater 1 -->
<div>
  <svg width="480" height="480">
    <g stroke-width="1px" id="g" />
  </svg>
  <div>
    <label>Sweater 1 stroke-width</label>
    <input type="range" id="stroke-width-input" class="input-div" min="0.1" max="20" value="0" step="0.1" />
  </div>
  <button id="button1">Recreate Sweater 1</button>
</div>

<!-- Sweater 2 -->
<div>
  <svg width="480" height="480">
    <g stroke-width="1px" id="g2">
      <defs>
        <!-- Define the pattern -->
        <pattern id="pattern-chevron" x="0" y="0" patternUnits="userSpaceOnUse" width="24" height="24" viewBox="0 0 10 10">
          <linearGradient id="Gradient1" x1="0" x2="0" y1="0" y2="1">
            <stop offset="5%" stop-color="forestgreen" />
          </linearGradient>
          <g id="chevron">
            <rect id="rect" x="0" y="0" width="100" height="100" fill="url(#Gradient1)" />
            <path d="M0 0l5 3v5l-5 -3z" id="path1" />
            <path d="M10 0l-5 3v5l5 -3" id="path2" />
          </g>
        </pattern>
      </defs>
    </g>
  </svg>
  <div>
    <label>Sweater 2 stroke-width</label>
    <input type="range" id="stroke-width-input2" class="input-div" min="0.1" max="20" value="0" step="0.1" />
  </div>
  <button id="button2">Recreate Sweater 2</button>
</div>
!

CSS 

              
                body,
div {
  display: flex;
  justify-content: center;
  align-items: center;
}
svg {
  border: 1px solid black;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 10px;
}
div {
  flex-direction: column;
  margin: 10px;
}

button {
  margin: 10px;
  padding: 10px;
}

@media screen and (max-width: 1000px) {
  body,
  div {
    flex-direction: column;
  }
}
!

JS 

              
                const button1 = document.getElementById("button1");
const button2 = document.getElementById("button2");
const globalInSvg = document.getElementById("g");
const globalInSvg2 = document.getElementById("g2");
const strokeWidthInput = document.getElementById("stroke-width-input");
const strokeWidthInput2 = document.getElementById("stroke-width-input2");
const gradientColors = Array.from(
  document.getElementsByClassName("gradientStopColors")
);
let hue, saturation, lightness, alpha;

const getRandomNum = (max) => Math.floor(Math.random() * Math.floor(max));

const getRandomInt = (min, max) => {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
};

const generateRandomDecimal = () => Math.random().toFixed(1);

function addPolygonTagsToHTML() {
  let polygon = document.createElement("path");
  let polygon2 = document.createElement("path");
  polygon.setAttribute("class", "polygons");
  polygon2.setAttribute("class", "polygons2");
  for (let i = 0; i < 14; i++) {
    globalInSvg.innerHTML += polygon.outerHTML;
    globalInSvg2.innerHTML += polygon2.outerHTML;
  }
  globalInSvg.appendChild(polygon);
  globalInSvg2.appendChild(polygon2);
}
addPolygonTagsToHTML();

function addPathsInside() {
  let pathsInside = document.createElement("path");
  let pathsInside2 = document.createElement("path");
  pathsInside.setAttribute("class", "pathsInside");
  pathsInside2.setAttribute("class", "pathsInside2");
  for (let i = 0; i < 20; i++) {
    globalInSvg.innerHTML += pathsInside.outerHTML;
    globalInSvg2.innerHTML += pathsInside2.outerHTML;
  }
  globalInSvg.appendChild(pathsInside);
  globalInSvg2.appendChild(pathsInside2);
}
addPathsInside();

const polygons = Array.from(document.getElementsByClassName("polygons"));
const polygons2 = Array.from(document.getElementsByClassName("polygons2"));
const pathsInside = Array.from(document.getElementsByClassName("pathsInside"));
const pathsInside2 = Array.from(
  document.getElementsByClassName("pathsInside2")
);

const getRandomDecimal = () => {
  let arr = [0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8];
  return arr[Math.floor(Math.random() * arr.length)];
};

const addOutline = (el, sweaterNum) => {
  let sweaterOutline = `
    M${80},${80} 
    Q${40},${90} ${30},${200} 
    Q${30},${380} ${40},${420}  
    L${40},${460} 
    Q${50},${470} ${96},${460} 
    Q${100},${450} ${96},${430} 
    Q${100},${430} ${120},${200} 
    Q${110},${420} ${130},${430} 
    L${130},${460} 
    Q${140},${470} ${360},${460} 
    L${356},${426} 
    Q${380},${420} ${370},${200} 
    Q${380},${420} ${400},${430} 
    L${400},${460} 
    L${440},${460} 
    L${440},${430} 
    Q${450},${420} ${460},${280} 
    Q${460},${180} ${440},${100} 
    Q${430},${80} ${320},${34} 
    Q${310},${30} ${300},${20} 
    Q${240},${20} ${200},${20} 
    Q${200},${30} ${80},${80} `;
  if (sweaterNum === 1) {
    el[0].setAttribute("d", sweaterOutline);
    el[0].setAttribute("stroke", `rgb(0,0,0)`);
    el[0].setAttribute(
      "fill",
      `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)})`
    );
    return;
  }
  // 2nd sweater fill
  el[0].setAttribute("d", sweaterOutline);
  el[0].setAttribute("stroke", `rgb(0,0,0)`);
  hue = getRandomNum(360);
  saturation = getRandomNum(100);
  lightness = 30;
  alpha = getRandomDecimal();
  el[0].setAttribute("fill", `url(#pattern-chevron)`);
  return;
};

// for 2nd sweater only
const createPatternedBg = () => {
  document
    .getElementById("rect")
    .setAttribute(
      "fill",
      `hsla(${hue}, ${saturation}%, ${
        lightness + getRandomInt(20, 40)
      }%, ${alpha})`
    );
  document
    .getElementById("path1")
    .setAttribute(
      "fill",
      `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`
    );
  document
    .getElementById("path2")
    .setAttribute(
      "fill",
      `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`
    );
};

const addCollar = (el, sweaterNum) => {
  let collar = `
    M200,20
    Q220,40 250,40
    Q250,40 260,40
    Q280,40 300,14
    Q305,14 310,26 
    Q300,50 250,56
    Q210,56 180,30
    Q200,0 290,10
    Q305,10 310,26 
    `;
  if (sweaterNum === 1) {
    el[1].setAttribute("d", collar);
    el[1].setAttribute("stroke", `rgb(0,0,0)`);
    el[1].setAttribute(
      "fill",
      `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)})`
    );
    return;
  }
  // 2nd sweater collar
  el[1].setAttribute("d", collar);
  el[1].setAttribute("stroke", `rgb(0,0,0)`);
  el[1].setAttribute("fill", `hsla(${hue}, ${saturation}%, ${lightness}%, 1)`);
  return;
};

const addZigzagLines = (el) => {
  let x1 = 150;
  let y1 = 100;
  let design1 = `M${x1},${y1}`;
  for (let j = 0; j < 3; j++) {
    for (let i = 150; i < 320; i += 20) {
      design1 = design1 + ` L${x1 + 10},${y1 + 10} L${x1 + 20},${y1}`;
      x1 += 20;
    }
    y1 += 40;
    x1 = 150;
    design1 = design1 + ` M${x1},${y1}`;
  }
  el[0].setAttribute("d", design1);
  el[0].setAttribute("stroke-width", 4);
  el[0].setAttribute("fill", `transparent`);
  el[0].setAttribute(
    "stroke",
    `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)}`
  );
};

const addChristmasTrees = (el, sweaterNum) => {
  let x1 = 180;
  let y1 = 220;
  let design1;
  for (let i = 0; i < 3; i++) {
    design1 = `
    M${x1},${y1} 
    L${x1 + 10},${y1 + 10} 
    L${x1 + 4},${y1 + 10} 
    L${x1 + 15},${y1 + 20}
    L${x1 + 8},${y1 + 20} 
    L${x1 + 20},${y1 + 30} 
    L${x1 + 5},${y1 + 30}
    L${x1 + 10},${y1 + 40} 
    L${x1 - 10},${y1 + 40}  
    L${x1 - 5},${y1 + 30}  
    L${x1 - 20},${y1 + 30} 
    L${x1 - 8},${y1 + 20} 
    L${x1 - 15},${y1 + 20}
    L${x1 - 4},${y1 + 10} 
    L${x1 - 10},${y1 + 10} 
    z
    `;

    // first sweater
    el[i + 1].setAttribute("d", design1);
    el[i + 1].setAttribute("stroke-width", 4);
    el[i + 1].setAttribute("fill", sweaterNum === 1 ? "transparent" : "green");
    el[i + 1].setAttribute(
      "stroke",
      sweaterNum === 1
        ? `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)}`
        : "white"
    );
    x1 = 180 + (i + 1) * 60;
  }
};

const addSnowflakes = (el) => {
  let x1 = 180;
  let y1 = 320;
  let design1;
  for (let i = 0; i < 4; i++) {
    design1 = `
    M${x1 - 20},${y1} 
    L${x1 + 20},${y1} 
    M${x1},${y1 - 20} 
    L${x1},${y1 + 20} 
    M${x1 - 12},${y1 - 12} 
    L${x1 + 12},${y1 + 12} 
    M${x1 + 12},${y1 - 12} 
    L${x1 - 12},${y1 + 12} 
    z
    `;
    el[i + 4].setAttribute("d", design1);
    el[i + 4].setAttribute("stroke-width", 4);
    el[i + 4].setAttribute("fill", `transparent`);
    el[i + 4].setAttribute(
      "stroke",
      `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)}`
    );
    x1 = 180 + i * 60;
  }
};

const addRandomDesign = (el) => {
  let x1 = 140;
  let y1 = 360;
  let design1;
  for (let i = 0; i < 13; i++) {
    design1 = `
    M${x1 + getRandomInt(1, 200)},${y1 + getRandomInt(1, 20)} 
    L${x1 + getRandomInt(1, 200)},${y1 + getRandomInt(20, 40)} 
    `;
    el[i + 8].setAttribute("d", design1);
    el[i + 8].setAttribute("stroke-width", 4);
    el[i + 8].setAttribute("fill", `transparent`);
    el[i + 8].setAttribute(
      "stroke",
      `rgb(${getRandomNum(255)}, ${getRandomNum(255)}, ${getRandomNum(255)}`
    );
  }
};

const createSweater = () => {
  addOutline(polygons, 1);
  addCollar(polygons, 1);
  addZigzagLines(pathsInside);
  addChristmasTrees(pathsInside, 1);
  addSnowflakes(pathsInside);
  addRandomDesign(pathsInside);
};

const createSweater2 = () => {
  addOutline(polygons2, 2);
  createPatternedBg();
  addCollar(polygons2, 2);
  addZigzagLines(pathsInside2);
  addChristmasTrees(pathsInside2, 2);
  addSnowflakes(pathsInside2);
  addRandomDesign(pathsInside2);
};

function setStrokeWidth(event) {
  globalInSvg.setAttribute("stroke-width", event.target.value);
}

function setStrokeWidth2(event) {
  globalInSvg2.setAttribute("stroke-width", event.target.value);
}

createSweater();
createSweater2();

button1.addEventListener("click", createSweater);
button2.addEventListener("click", createSweater2);
strokeWidthInput.addEventListener("input", setStrokeWidth);
strokeWidthInput2.addEventListener("input", setStrokeWidth2);
!
999px

Console