you go for it princess somebody else was asking the same questions and did not get the response that they should have
some shows have white coats some don't
mv accredited is not as straight forward as portraid on here if you have sheep already the test takes ages if you don't have sheep and not had sheep for at least 10 months and buy mv accredited sheep in .the test and every thing involved is straight forward your vet takes blood samples they are sent to the sac they test and issue the paper work it costs about £60 per sheep (only usefull if you are selling or intending to sell pedigree stock to other pedigree breeders with mv flocks
some sheep are washed about a week before the show and wear jackets to keep them clean
some shows have them on halters some don't
it is the representation of the breed and some breeds will never make the high accolade of being champion same as cattle/pigs/horses/goats and poultry
just enjoy the day and observe