クエーカー教徒には決まった服装がありますか？
As a part of their testimony of simplicity, Quakers (Religious Society of Friends) traditionally wore plain dress; "Ruffles and lace and other forms of ornamentation, as well as unnecessary cuffs and collars and lapels and buttons, were forbidden." George Fox implored fellow Quakers to wear plain dress: 
Quakers (Religious Society of Friends) traditionally wore plain dress