HOW TO MEASURE T-SHIRT "Chest" : Measure under your arms around your back and across the fullest part of your chest. Be sure to keep the measuring tape level across your back and comfortably snug, but not too loose.
HOW TO MEASURE BASEBALL TEE "Width" : Lay the shirt flat on a table and be sure to get the wrinkles or folds out, but don't stretch the shirt. Start at the top of the seam where the sleeve attaches to the body of the shirt (the armpit) and measure flat across the chest to the same point on the other side of the shirt
HOW TO MEASURE T-SHIRT & BASEBALL TEE "Length" : Lay the shirt flat and measure from the top of the next seam to the bottom of the shirt.