Re: Colored Belt or White,
Hum, as far as I know the biggest Aikido organisation within the UK is the BAA. Sadly, I don't have more details than that. If anyone can correct or provide numbers that would be great. Anyways, the BAA uses color belts for kyu grades and have done so for as long as I can remember.
Color belts and hakama are very much a dojo specific thing. When in Rome, do as the roman.