Old garment worn regularly by strongman (4)
I believe the answer is:
toga
This clue could be a double definition.
'old garment' is the first definition.
(garment worn in ancient Rome)
'worn regularly by strongman' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for toga that I've seen before include "Robe for an ancient Roman" , "Classical garment" , "Roman dress" , "This ancient robe might get your goat" , "Old Roman gown" .)