When I was part of a QB in 1985, everyone was wearing shorts (myself included) and no one ever mentioned a word
The last quick build I was involed with was in 1997. Defintely no shorts were allowed and any t-shirts with "worldly" says was out. Shorts thing was for safety (which made sense) and the t-shirt thing was more of a public / media thing (in case the newspapers came by).
Actually, the biggest "problem" we had (regarding rules being broken) were brothers swearing! lol!