What kind of boot do you like? As far as I know, there's no specific type that's banned, except for high-heeled boots for the femmandos (if they're really tall). I may be mistaken, but I think cowboy boots are also not allowed (or just frowned upon). Leather-type work boots or combat boots seem to be popular. If that's what you're thinking, visit your local army surplus shop.
If they have laces, you'll need to cover that up. If they have buckles and straps, you're fine. If they have any logos, they must be removed or covered up.
Find a pair that's decently comfy and then buy yourself a good pair of insoles.
Good luck!