At three of four showground I've been to they were lenient on horse gear and rider wear, but I was competing in english showjumping, games etc So at my first ever show I was wearing my jodphurs, a collared T-shirt, and long gumboots that looked like riding boots(cleaned of course), for the lack of having show gear.
At one of my more recent shows I was dressed proper, in beige jodphurs, white formal shirt, black show jacket, jodphur boots and a bright tie/bubbles with matching saddle blanket (because my horse is a dark bay so she stands out well with bright colours)
I don't know much about the scoring because in the flat classes I have competed in the didn't have a clip board they just asked us to ride around in a circle at the gait they called and they picked out which horses suited/did it properly. [This is where the pet peeve of mine comes in though, last show I groomed for a friend who didnt get picked because her horse was not coloured or a grey or a palomino.
R.I.P ~ Bubbles - 25yo tb mare - 13.04.2011 ~ 8:30am ~ passed away naturally and peacefully in my arms