xctrygirl -
Check out this - the latest episode on Dressing for the Hunt. Answers all your questions nicely.
All horse sports (as JS mentioned) have a “uniform” – WP, Sidesaddle, Saddleseat, Driving, Dressage, hunter/jumpers, etc, etc. I think eventing, as one of the youngest equine sports, is 2nd only to endurance as the most non-regulated in attire (at least in their x-country phase).
Foxhunting, as one of the oldest equine sport (next to driving and dressage) has a longer history behind it, and has very good reasons for the apparel requirements. For one: those wonderful heavy wool Meltons are used not only to keep the rider warm, but in an emergency can be used as a blanket on a downed rider to keep the injured person warm. Those stock ties act as slings for broken or damaged body parts on horses and humans – the stark white can be seen for a distance and acts as a beacon to announce that someone (or some horse) is injured and in need of aid - even moresso if red blood is soaking through. Brown gloves don’t show dirt from grabbing gates, assisting a stuck hound, or wiping mud off one’s coat after a hard, fast run - hence, they will retain a “clean” look from start to finish.
For two: a field of black coats and tan breeches and saddle pads that fit the saddle and don’t show an excess of white or color create a unit that blends into the background and isn’t a distraction for the staff or onlookers, or the fox (which can see contrasting hues and some colors). That’s why Masters will keep their fields tightly together – to become invisible, as well as position the riders where they can enjoy the hounds without being a disturbance. You’re not out there to be noticed – only those awarded the right to wear a red coat have that distinction, and the responsibility that goes along with it.
You are hunting in Unionville in a time honored hunt. While leeway is always given to those capping who are not members of a hunt, and for grooms, it behooves you (even as a groom) to dress the part as tradition calls for (as was posted previously) if you want your career to be taken seriously and if hunting - even on an every-now-and-then basis - is part of your job.
Put on your typical eventing clothes and eventing tack when you event. Put on traditional hunting clothes and hunting tack when you hunt.