Fine fancy lingerie needs navy lacework (8)
I believe the answer is:
filigree
'lacework' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for filigree that I've seen before include "Ornamental lacework in gold or other metal" , "Delicate ornamental metal work in gold or silver" , "Delicate tracery" , "Ornamental wirework" , "Delicate ornamental metalwork" .)