Twirls following foxtrot finale, revealing underwear (7)
I believe the answer is:
teddies
'underwear' is the definition.
(a teddy is an women's all-in-one undergarment)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for teddies that I've seen before include "Soft toy bears" , "Children's toy bears" , "Undergarments and children's toys" .)