<p>右斜めボーダー</p>
<div class="box bg_skew_border"></div>

<p>左斜めボーダー</p>
<div class="box bg_skew_border is-left"></div>

.box{
  width:100%;
  height:200px;
}

/* 右斜め */
.bg_skew_border{
    background-color: #fc693b;
    background-image:
	 repeating-linear-gradient(-45deg,
	 #fff, #fff 7px,
	 transparent 0, transparent 14px);
}

/* 左斜め */
.is-left{
  background-image:
  repeating-linear-gradient(45deg,
	 #fff, #fff 7px,
	 transparent 0, transparent 14px);
}