Should I wear my previous gym belt at a new gym?

When transitioning to a new gym, wearing your earned belt is the standard practice and the expected approach. Showing up at a new gym wearing a lower belt than you have earned creates confusion and can be seen as dishonest if discovered later. Be upfront about your training history, including any breaks or time away from the mat. Your new instructor will form their own assessment of your skills over the first few weeks of training. If there is a significant gap between your belt and your current performance, they will work with you to improve. The adjustment period at a new gym is normal. Different gyms have different styles, and techniques that worked at your old gym may not work as well against new training partners. This does not mean you do not deserve your belt. It means you are adapting to new challenges, which is a natural part of BJJ growth. Within a few weeks, you will acclimate and your skills will recalibrate.