How to Sign "Tshirt"
To sign "T-shirt", let your non-dominant arm rest naturally at your side. Form a flat handshape with your dominant hand, keeping your fingers together and your palm facing down. Bring your dominant hand across your chest and tap the side of your non-dominant upper arm, right about where the hem of a short sleeve would sit. You can tap it once or twice. This simple motion visually represents the short sleeves that characterize a T-shirt.