Question: are aerie underwear true to size?
Answer: But for the most part they're true to size and if I'm not mistaken a 4/5 is a small, so that's what I'd recommend. They also do a 10 for $30 sale so be on the lookout for that! It's their best deal. I'm a 6 to 8 ae jeans and wore their medium underwear and it was a good fit for me.