For You
Jodphurs: Canary/Yellow (ish). Never white or cream though. Cream is acceptable if you really dont have anything else.
Shirt: Cream/yellowish (make sure it fits nicely around your neck!!)
Tie: Any colour but i like Red, with maybe a pattern through it??
Jacket: Tweed (green, blue or yellowy to go with his colouring. Dont go for a brown on him.)
Hat: Hard hat (nacy/ with flesh straps).
Gloves: depends upon the colour of your tack (havana or black - never cream, it highlights your hands)
Cane/Whip: Completes the overall picture. I prefer a plain brown/black but many opt for a Bamboo.
Shoes: Long riding boots in either black or brown. If they have a straight top then you need garter straps as well
For the Horse
Bridle: Just make sure its clean. No martingales, brestplates etc.
Browband: Hunter - plain, workman like
Riding Horse - Velvet coloured (match your tie etc.)
Plaiting: Plait his mane and forelock, and pull or plait his tail, depending on which you can do
Trimming: Trim all his feathers off, cut his tail to 4 inches below his hocks (do this gradually, until it looks right), trim his whiskers, including eye whiskery bits. And make sure his 'beard' is nice and neat
Nummnah: Either dont wear one, or one that is the same colour as your saddle, and is shaped to it.
Hope that helps, anything i missed?? xxx