Vintage-Inspired Lavender Bridesmaid Dress sz 16

I was so excited for this dress. I went with the XL instead of L thinking it would run small. I was NOT wrong. My ribcage is very wide, and this thing doesn't even come close to closing. This dress has never been worn out. Only worn to try it on and take pics for Poshmark. It is high quality and comes all the way from England. If I could zip it shut, I'd keep it forever. But I'd need surgery to get it to close, so please take it! For reference, measurements Chest 42, Waist 34, Hip 41, Thigh 26