Black Dance Briefs, Girls Dance Briefs

Black Dance Briefs have been around for ages. They are used by dancers to protect their thighs from the chafing caused by garter belts. [based on a comment from the original post.
Dance brief with flat lock stitch detail.Nylon spandex.

Shorts & Skirts – Footloose Dance Wear

Studio 7 Attitude Sequin Shorts – Menai Dance Centre

Floral Acro Dance Briefs – Black Sapphire Design

Bloch Girl's Lycra V-Front Shorts - Dance Street

Adult & Kids Dance Shorts, Dance Briefs

Capezio Boy Cut Low Rise Dance Shorts Child and Adult Sizes – Dance Irish

Type: Briefs For Ballerina, Gender: Girls Adult, Material: 95% Cotton+5% Spandex, Color: Nude, White, Black, Size: S,M,L(Children type, Adult type),

Ballet Dance Briefs Girls Women Adult Skin Color High Cut Underpants Underwear Cotton Gymnastics Bottom

Black High Waist Brief

So Danca 4085 Dance Yoke Shorts - Ladies

OVIGILY Child Black Dance Briefs Jazz Cut Girls Spandex Ballet Dance Briefs Lycra Mid Waist Cheer Briefs Workout Underwear Kids