How to add a border to an element that's using clip-path?

Question

I have an image that's been clipped using the CSS clip-path property, details below -

clip-path: polygon(0 100%, calc(20% - 100px) 100%, 100% calc(100% - 100px), 100% 0%, 0% 0%);

Is it possible to add a bottom border to it to follow the line of the clip path?

Thanks!