IF you go to your local tack store or feed store or 
tractor supply type store you should be able to find horse shampoos, specific for color coats, white, and the like. You can also use bagged chalk to help white the whites even more. Also using a hoof blackner to have all the hooves appear to have the same color is god, or a clear glossy type.
The "fishnet" type is called a continental braid and is used on long maned horses that do not require the shorter hunt or WP type 3 inch length of banding or braid.
If you are showing a horse breed that would other wise have a long mane such as a welsh, arabian, friesian, or gaited breed you can do the french braid or the continental type "braid".
It isn't a true braid but more of a splitting of the sections and rubber bands that create a "fishnet" type of look.
Also very important to remember is DO NOT show sheen or detangler where you you put your saddle.. IT WILL SLIP>.. at the most inopportune time!!
It did for me at a schooling show. 
Equitation is also Not so much HOW the horse goes, partially that, but in equitation, its also how YOU look riding the horse.
My sister in law has an older Appendix QH that did barrels.. her head and neck stick way out, and is NOT on the bit... but she wins in english equitation, because what SHE is doing it right...
Hope that helps.. Also google hunter eq and english eq and see what the differences are.
I like combined training.. its dressage then jumping.. dressage, you and the horse are scored doing a pattern.. the jumping.. clean and quick.. you can look like poop, but if you and the horse
get over the jumps fast enough and don't knock any down.. you are good to go!!!
LOL
Carol