The characters were dressed in full periodcostume.
剧中人物全都身着具有时代特色的服装。
《柯林斯英汉双解大词典》
2
She is dressed in a periodcostume.
她穿着那个时代的服装。
3
In an entertaining sequence, we see Ming in Qing periodcostume in beautiful ancient Chinese settings, playing out a short drama in the style of a Chinese kungfu TV series.