Yes, NPC has guidelines regarding the suits you can wear on stage. Familiarize yourself with these rules before competing in NPC wellness competitions.
Wellness Competitors must wear a two-piece suit. The bottom cannot be a thong and the front cannot be too low. The Top for Wellness is the same standard as the Bikini Division. Whereas, the bottom must be V- shaped in front and traditionally made with all fabric on the hips and no connectors. However, some federations do allow bottoms with connectors and you will not be scored differently