BJJ Rashguard's are now a standard item in most combat sports gyms often worn under a BJJ Gi in Brazilian Jiu Jitsu Classes or in place of a tee shirt in MMA.
If you are starting in martial arts then chances are you don’t have any equipment at all, even if you do, have you got the right gear for your sport or the quality level of equipment you need to avoid injuries early on in your martial arts journey.