Bri is 5'5" and wearing the Sky Blue Romper in Small, which fits true to her size.
Val is 5'6" and wearing the Black Romper in XL; she is usually between an L & XL but did feel the XL was a great fit.
S: bust 28 in, bust 36 in, waist 25 in, sleeve length 6 in
M: bust 29 in, bust 38 in, waist 27 in, sleeve length 6 in
L: bust 30 in, bust 40 in, waist 29 in, sleeve length 6 in
XL: bust 30 in, bust 43 in, waist 32 in, sleeve length 6 in