Usually you can show with white or black gloves. White gloves show all the movement with your hands so I wouldn’t recommend them if you don’t have quiet or soft hands. Black gloves also look nice and don’t show much hand movement. I honestly think white gloves look better for turnout but not if your hands can’t stay still.
In my rules- USDF. You can show in black or white. But if you have good/steady hands wear white; if you dont have the best or you do a right,left,right,left type thing to get your horse round. Wear black. They stand out less.
In lots of countries you can wear only white gloves for dressage competitions and I think it should be like that cause you see every move of riders hands better than in black gloves and it looks really good tbh :)