Look in idiot husband's items of underwear (10)
I believe the answer is:
loincloths
'items of underwear' is the definition.
'loincloths' can be an answer for 'underwear' (I've seen this before). I am not sure about the 'items of' bit.
'look in idiot husband's' is the wordplay.
'look' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'idiot' becomes 'clot' (I've seen this before).
'husband's' becomes 'h's'.
'lo'+'in'+'clot'+'hs'='LOINCLOTHS'
Can you help me to learn more?
(Another definition for loincloths that I've seen is " Underwear".)