The RVCA Triangle Muscle Tee in Black. The Triangle Muscle Tee is the latest new style from RVCA. This little number is sleeveless with a solid colorway, a lightweight cotton material, and a ribbed scoop neckline. Pair it with your favorite light wash jeans and flats for an easy look. Solid colorway. Sleeveless. Lightweight. Ribbed scoop neckline. Center front contrast graphics. Machine wash. 100% cotton. Imported. By RVCA. Model Stats. Katelyn is wearing a size Small. Our model Katelyn is 5'10" tall with a 32" bust, 24" waist, and 35" hips.