NWT Designer Los Angeles Atelier size 2 fits like M.long sleeve red flowy

This beautiful dress has a sheer slip underneath and then a thicker fabric over top one layer sleeves that are sheer that have a triangle cut out at the end from shoulder down it’s 30 inches from shoulder to shoulder is 14 inches and from Pitt to pit is 17 inches the sleeves are 22 weeks and it zips up the back The dresses size 2 I think it fits kind of like a medium