Select source 'srcset' with jquery

I would like to know how to select spcecific 'srcset' in my code using js. This is my actually not working js code :

var imgPath = $('.wp-post-image').attr('srcset');
$('.tax-product_tag .breadcrumbs').css('background', 'url(' + imgPath + ')');

And here is the HTML :

<img width="300" height="300" src="//agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-300x300.jpg" class="attachment-woocommerce_thumbnail size-woocommerce_thumbnail wp-post-image" alt="" srcset="//agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-300x300.jpg 300w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-150x150.jpg 150w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-768x768.jpg 768w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-1024x1024.jpg 1024w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-575x575.jpg 575w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-190x190.jpg 190w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-370x370.jpg 370w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-600x600.jpg 600w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-100x100.jpg 100w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-400x400.jpg 400w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-900x900.jpg 900w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-675x675.jpg 675w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-286x286.jpg 286w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-450x450.jpg 450w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine-1080x1080.jpg 1080w, //agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine.jpg 1500w" sizes="(max-width: 300px) 100vw, 300px">

The js code is working with 'src' attribute but this is selecting the 300x300 jpeg and i would like to get the orginal jpeg ( agothegoodlifestore.com/wp-content/uploads/2018/04/la-mericaine.jpg )

Thks a lot for help, first time using stack overflow, sorry if I did mistakes with my question.