This is a video recording of a person made by attaching lights or reflective markers to their joints while they wear a black body suit.

被观察者要身着一身黑衣，并将光源或标记物附在他们的关节上进行录像。

youdao

Girls pan head, not wearing a tiara, no makeup, wear condole belt gym suit, soft shoes; Boys wearing black pants, white conjoined ku bar training suit, soft shoes.

女生盘头、不戴头饰、不化妆，穿吊带体操服、舞蹈软鞋；男生穿黑色练功短裤、白色连体挎栏训练服、舞蹈软鞋。

youdao

What's so sublime about being on a tropical beach where you know nobody is, you can wear your unattractive, black, one-piece YMCA bathing suit with abandon.

WSJ: Ali Wentworth on a Solo Vacation to Turks and Caicos | Traveler's Tale