How to Sign "Costume"
To sign 'costume,' start by forming both hands into open '5' handshapes with your fingers spread wide and palms facing your body. Bring your hands up to your upper chest area, lightly resting the tips of your thumbs against your clothes. Brush both hands downward simultaneously in a quick, short motion. Lift your hands slightly and repeat the downward brushing motion a second time. This is the same sign used for 'clothes,' relying on context to convey 'costume.'