Gray Maternity T-shirt Dress

Comfy T-shirt dress says size medium but fits a size Small ! Or dress size 4 before pregnancy and can fit smaller then that as well 90%cotton. NWOT. Never worn, tried on only! (Not for extremely pregnant 3rd trimester ladies) 2nd trimester best into beginning of 3rd maybe. 1st trimester def okay! Its just a bit too tight for me bc i am currently 34 weeks, all belly, and 145lbs. I was a dress size 4 prior.