Midi loose dress with pockets

This is one of the most flattering dresses I’ve ever owned, I love wearing without a bra. I’ve gotten a little bit too large for it though so parting ways. Two slits on the side has has pockets. I would say small would best fit it, I’m 5’9 and the length is perfect on me. TNA Aritzia Wilfred Free People Babaton Talula