So, I'm dressed in new lace underwear! (8)
I believe the answer is:
camisole
'underwear' is the definition.
(I've seen this before)
'so i'm dressed in new lace' is the wordplay.
'dressed' indicates an anagram ('dress' can mean 'prepare').
'in' is an insertion indicator.
'new' is an anagram indicator.
'so'+'im'='soim'
'soim' anagrammed gives 'miso'.
'lace' is an anagram of 'cale'.
'miso' put into 'cale' is 'CAMISOLE'.
(Other definitions for camisole that I've seen before include "Top" , "nightwear" , "Short undergarment for women" , "Slip" , "Item of lingerie" .)