Originally Posted by Taffy Clayton
You can't go wrong in canary.
Depends what you're showing. Riding ponies/Welsh B type show ponies and I believe Arabs (although I've gotten away with my tweed in an Arab ring) are supposed to be shown in navy jacket and canary breeches, but most other native breeds/m&m/cob types and hunter or hack types should be shown in tweed with beige breeches. Not white for showing, only for dressage, although here you can get away with tweed and beige for low level dressage (certainly to novice, if not to elementary)
(That's British hunter and hack classes, showing flat under saddle with the judge riding and an in-hand portion, not the American Hunters where you actually jump.... that's more like our Working Hunter)