Set of outer clothes popular in the 1940s consisting of a long coat with wide padded shoulders and pegged trousers (4,4)
I believe the answer is:
zoot suit
(Other definitions for zoot suit that I've seen before include "Popular menswear in 1940s' USA" , "retro gear" , "Flashy 1940s' item of menswear" , "1940s' style of jacket with padded shoulders and tapering trousers" , "Spiv's flashy attire" .)