Having time off, the lasses hang about looking decorative (7)
I believe the answer is:
tassels
But I can't explain it at all! Could you help me understand?
(Other definitions for tassels that I've seen before include "Ornamental bunches of cords" , "Ornamental bunches of threads as on curtains" , "Tufts of decorative hanging threads" , "Decorations" , "Bunches of cords for decoration" .)