Wearing a size small in the shirt. Has a nice stretch to it and very comfortable and not thin fabric. It’s breathable but not sheer. I couldn’t get the size 4 pants on past my thighs lol the size 6 was perfect and snug. You could even size up if you want a loose fit. The pants have little to no stretch LTKFindsUnder100 LTKSaleAlert LTKStyleTip