D.C. Mun. Regs. tit. 19, § 2409
2409.1 Each contestant shall wear mixed martial arts shorts, biking shorts, or kickboxing shorts.
2409.2 Gi's or shirts are prohibited during competition.
2409.3 Shoes are prohibited during competition.
SOURCE: Final Rulemaking published at 54 DCR 7224 (July 27, 2007).