Sew name originally on right shirt or trousers, say? (8)
I believe the answer is:
menswear
'shirt or trousers say?' is the definition.
'sew name originally on right' is the wordplay.
'originally' indicates anagramming the letters.
'on' means one lot of letters go next to another.
'right' becomes 'r' (common abbreviation).
'sew'+'name'='sewname'
'sewname' anagrammed gives 'menswea'.
'menswea'+'r'='MENSWEAR'
(Other definitions for menswear that I've seen before include "Gents' clothing" , "it covers their bodies" , "Traditionally suits, shirts etc." , "Sort of clothing" , "Male clothes" .)