Are these clothes traditional clothes German people would wear or are they just typical European clothes?
この場合、次のような言い方ができますよ。
ーAre these clothes traditional clothes German people would wear or are they just typical European clothes?
「これはドイツの民族衣装ですか、それともヨーロッパ風の服ですか?」
traditional clothes German people would wear「ドイツ人が着る伝統衣装」と言えます。
ご参考まで!