我穿着这样正式的衣服觉得很拘谨。

I felt ill at ease in such formal clothes.

《牛津词典》

新郎则穿着正式的西装或燕尾晚礼服，几位熟朋友参加婚礼并协助帮忙，包括了伴郎和伴娘。

The groom wears a formal suit or tuxedo. Several close friends participate in the ceremony as attendants, including the best man and the maid of honor.

youdao

在较正式的情况中，你可能要照规定穿着，例如“请着正式服装”等等。

For more formal affairs, you will probably be told what to wear, such as "formal dress requested," etc.

youdao