I've seen them in antique stores but never noticed them in use before

Whatever they were singing, it was probably a nostalgia song. These chorus girls are wearing the "mannish" outdoor sports costume that was in fashion about twenty years earlier than 1917, with the hair and makeup popularized by Charles Dana Gibson's illustrations. Here is a closer visual link to their specific outfits, if not the hair, in John Singer Sargent's 1897 oil portrait of Mr. and Mrs. Isaac Newton Phelps Stokes, now in the Metropolitan Museum.

Those ladies are representative of my grandmother's generation; my father was 3 when the picture was made. She was a handsome woman.

Compare with this group of ladies from just three years later (circa 1920).

Would you show us the horses?

Apparently every era has its own version of girls with whips.

in their costumes could dress 35 women today.

I'm guessing if the Red Queen saw the sunny smile on the one on the right, she'd smack her with the golf club.

[That's a riding crop. - Dave]

look like Stan Laurel in drag.

I was searching for a prop for one of our shows and typed in "Cupid's Bow" and sure enough, the first few hundred hits were "lipstick styles," not archery items.

The Elite Eight?

I don't know when but would like to find out what period women started to groom their eyebrows. Look at the variety we have here!

Sans her makeup.

Women looked SO different back then. Everything about them was different (hair, makeup, facial expressions, posture, clothes, demeanor).

"Run! Run quickly!"