Jella Couture slip dress

I loved this dress when it fit me, it’s just a little too snug now! It’s a size small, but I am listing as an XS due to the fact the fabric doesn’t give. I am 5ft and it hits me around the knees. The sleeves are 3/4 length. It has a slip like liner underneath in the same navy seen in the design. 100% polyester so outer layer doesn’t really give.