Pastel/neutral, green sleeveless stretch, material, spring/summer shirt, medium

This women’s neutral color arm fatigue on the right side, green or what would be considered a neutral, dark, baby green. Was never worn because they sent the wrong size and I didn’t realize it until now. Almost 6 months later. I planned on wearing this with a pair of dark green sweatpants, tucked in like it might be a bodysuit or a pair of baggy loose. Fitted BoHo pants around the house. But I did not notice the sales tag says large but the inside says medium.