Help! Show clothes for a 3 Year Old!

So I'm finding this to be IMPOSSIBLE. I need show clothes for my preschooler (3 years old) who will be showing in the walk/trot class.... problem is she is going to be showing english & I can't find anything! I actually found jodpurs at TARGET of all places - yaaa! But shirt, jacket, boots... nothing, help!

Ebay!!
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Any little white or pastel longsleeved blouse will do. So will kid's low boots in black. If you can't find a jacket, use a black or navy sweater that's close fitting. Judges don't look too carefully at the outfits at this age. Just make sure she looks tidy, long hair done up in a bun just below her helmet. A hairnet will help keep it tidy.

Stores like H&M (they have the kids section) have blazers that are identicle to tiny little riding jackets, even if you have to buy a boys jacket nobody will notice the difference.

What size I know someone whos selling a show attire that has won many a turnout class