FOREVER 21 Long Sleeve Black Multi-Color Geometrics Romper, Size M (see measurements below for fit).   
This fall one-piece has slant pockets, lined bottom, elastic waist & sleeves, and open back.
It weighs 7.4 oz and is in excellent pre-owned gently used clean condition (looks new).

All measurements are approximate:

WAISTBAND TO HEM = 13"
WAIST--SIDE TO SIDE = 14" to 18"
BODICE--ARMPIT TO ARMPIT = 20"
BODICE--SHOULDER TO WAIST = 17"
SLEEVES--SHOULDER TO HEM = 24"

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