Turnout for clear round jumping?

Ive been riding for 8 years but never really been able to go to shows but now's my chance :D Ive been to two showing shows and I have a clear round coming up. I have a black jacket, beige jods, Blk boots a white shirt and tie. Shall I wear this or something else? And I have been practicing about 2ft 6 with my horse shes still a little green and it'll be her first show. Any show/training tips? Also does she need to be plaited? She is an Arab x :)