Spurs Horse Tack

I usually compete my horse in small hunter classes, but recently a vet commented on her extravagent movement and suggested hogging her and showing her as a cob. Don't know anyone who does this so not sure on attire and tack. She is VERY strong and forward so is it acceptable to wear a plain double bridle? I have a plain brown Saddle from hunter classes which I'm pretty sure is okay.
Does anybody have anymore info on attire/tack/turnout and how classes are judged? I know the main things like hogged manes, pulled tails and trimmed feathers. Do they have to have quarter markers (eg. sharks teeth)? I know I have the right clothing for showing, but do I need dummy spurs and gaiter straps? Belt? Tie pin?
What are the height restrictions and what is the average amount of bone on the leg for a lightweight/medium weight/heavyweight?
Okay you get the jist of what I'm asking now
Any info would be appreciated!
Can't find much on google yet...