WPC/APC Shirt Rule
"One undershirt (of a design consistent with what is commonly called a T-shirt) with or without sleeves, may be worn under the lifting suit. It must be an individual article of cloth fabric. Its construction may consist of multiple plies but must, as a whole, be a singular component. The thickness(es) shall not be designed to increase, enlarge or enhance the body's natural musculature. Sleeves must be short and remain above the elbow when worn. It may be of any color or colors, but shall not portray indecency or be offensive to the spirit of the competition."