We did it last year - daughter was 8
She had 3 classes - SHP, WHP and Veteran
pony turned out as it was for the class plus a tonne of glitter! For us that was 3 tack changes as we had plain bridle then plain + martingale and then show pony bridle - but we had an hour between each class thankfully!
child - stayed the same for all classes:
navy jacket
navy hat
sparkly white stock
canary jods
white sparkly hair bits - I used a scrunchie as I couldn't find plait ribbons - more prepared for this year!!!
oxblood boots
brown gloves
normal showing cane/whip
this shows all the pics for a whole evening performance
http://www.markel-photography.co.uk/.../pr/index1.htm