Triangle/ NPC style bikinis with connectors are suitable for many other federations for bikini or wellness category. This style of bikinis you can use on NPC and other stages if you compete with PCA, GPO, NFMUK, GBO, 2BROS PRO EVENTS, NABBA, WABBA, UKUP.... also for natural bodybuilding federations but some of natural federations have slightly more glutes coverage with the fabric of the bottoms. Make sure if you going to compete with natural federations to check the rules on their website.