This shirt is a medium in Universal Standard sizing, which is equivalent to 18/20 in other brands. Please see photos for measurements and size chart. Worn only once and kept in a smoke-free, pet-free home. Washed in unscented detergent according to instructions on tag. I have more Universal Standard in my closet as well as other brands in similar sizes if you want to bundle. All items are from my own personal closet and were bought new (other than the re-poshing listings) so if you have a question about the item just ask! Offers welcome!