Hi! I show bantam silkies, bantam Rhode island reds, and bantam wyandottes. No there is no dress code, that I know of. It depends on weight, if you are showing meat birds, then yes you do weigh them. But other classes, standard, bantam etc, do not have to be weighed. When I get ready for a show, I always wash my silkies, like a dog. When I get my normal feathered birds ready, i just put Vet Rx on their combs and wipe off any dirt and poop off with a baby wipe. After i wipe them, i then put show sheen on them, because it makes them shiny. Hope this helped.
---Moon