long, short
She was wearing a short denim skirt.

ankle-length, calf-length, knee-length
tight
circular, flared, full, gathered, voluminous
She tucked up her voluminous skirts to make room for Jane.

A-line, mini (usually miniskirt), pencil, straight
pleated, wrap-around
cotton, denim, linen, etc.
plaid (esp. AmE), tartan
She wore the plaid skirt that was the uniform of her private school.

grass, hula
girls in grass skirts from Hawaii

matching
a green jacket with a matching skirt

hike up (esp. AmE), hitch up, lift, pick up, pull up
pull down
smooth, smooth down
She sat down, smoothing her skirt.

straighten

billow, swirl
Her full skirt billowed around her as she danced.

ride up
Her skirt rode up her thighs when she sat down.

fall
The skirt falls just above the knee.

length
suit (AmE)
I've worn both skirt suits and pant suits to interviews.

the hem of sb's skirt
I lifted the hem of my skirt.

Skirt is used with these nouns as the object:
edge