Perfect black dress

I bought this dress for a trip and it’s so cute but too small. Brand is Collusion and the structure is so flattering (if I could just get the zipper all the way up!) and I love a hike skirt. I bought it in size 4 and sadly need a 6 and am past the 28 day policy (holidays caught up with me). Tags still on. Originally $80 but selling for $60.