I think the boots would depend on your age, I don't know about 4H but I know over here it tends to be that under 16's wear jodphur boots and over 16's tall boots. Obviously there are exceptions but that seems to be the general idea. I would also say a tie is a nice idea. Posted via Mobile Device
I would speak with your club leader - they can give you specifics as it does vary sometimes from locale to locale, and the county level is often a bit more relaxed than the state.
Well first.. are you riding Saddleseat or Hunter or Dressage style? All can be classified under the broad category of "English Pleasure" at 4-H and some of the smaller open shows (horrifyingly). Your attire would be quite different, depending on which you are showing.