Sorry, I figured Richard Salyer would answer by now. It depends if you are talking about Kids rulings or High School. I assume you are talking about the Kids since you asked this question in the Kids forum. There is a modification on this ruling to the High School rule. Our kids modification states The legality of all uniforms will be up to the referee, and need not conform to the NFSHSA rule. This was made primarily because of some of the wrestlers using the "Freestyle" singlet.
As far as the undershirts. The High School rule states " A sleeveless shirt fastened at the crotch and cut no lower in the back or front than the level of the armpits and under the arms no lower than one-half the distance between the armpit and the belt line. If sufficient reason is determined by the referee a tight-fitting, short-sleeved undershirt of a single, solid color unadorned with no more than one manufacturer's logo/trademark/reference may be worn under the sleeveless shirt."
Sufficient reason is usually due to skin problems (acne) or obesity. It is still up to the Head official.
Richard if this is wrong feel free to correct me.
