I'm usually between a small and medium I bought a medium, the pants do not have stretch and zip in the back, the pants fit perfect. the coat is stunning and the train is perfect. it is long tho

I mistakenly ordered a medium in which I knew I needed a large because I ordered and wore the same outfit in black sz large & it fit perfectly. So I contacted fn to try to change the sz before it shipped but they said it was too late. So I purchased the same outfit again in a sz large. The 2nd outfit was delivered,I was so happy because I had an all white 50th birthday to attend. Popped the large tag,put the outfit on,noticed that pants were too tight and couldn’t zip up. Jacket wasn’t buttoning,so I checked the inside labels,why would fashion Nova attach a large tag to a medium outfit smh. So I was sent 2 medium outfits,1 with a large tag. They ruined my night because had the sent the right sz,the outfit would’ve fit perfectly. The large black was beautiful & I only shop on fashion nova luxe