Our sizing suggestion: TTS, if between could size up. Nursing friendly 

Model is size 4 & 5'6" wearing Small

Details: Lightweight blouse with ruffle front and elastic puff sleeves. Subtle pinstripe fabric. Not lined

Small
Upper bust 36"(measured at armpit of item) 
Length 20"

Medium
Upper bust 38"
Length 20.5"

Large
Upper bust 40"
Length 21"

Fabric content: 100 COTTON