Unusual label on jacket accompanying a cloak (8)
I believe the answer is:
djellaba
'cloak' is the definition.
(I know that djellaba is a type of cloak)
'unusual label on jacket accompanying a' is the wordplay.
'unusual' indicates anagramming the letters.
'on' indicates putting letters inside.
'jacket' becomes 'dj' (I've seen this in other clues).
'accompanying' means one lot of letters go next to another.
'label' is an anagram of 'ellab'.
'dj'+'a'='dja'
'ellab' placed inside 'dja' is 'DJELLABA'.
(Other definitions for djellaba that I've seen before include "Loose Arab cloak" , "dress for Arab lady" , "hooded cloak" .)