Welcome back stuff needed for pilgrim’s garment (5)
I believe the answer is:
ihram
'pilgrim's garment' is the definition.
(I've seen this before)
'welcome back stuff needed' is the wordplay.
'welcome' becomes 'hi' (both are greetings).
'back' is a reversal indicator.
'stuff' becomes 'ram' (ram can mean to stuff or push).
'needed' says to put letters next to each other.
'hi' reversed gives 'ih'.
'ih'+'ram'='IHRAM'
'for' acts as a link.
(Other definitions for ihram that I've seen before include "in a holy state" , "In Hajj robe" , "Pilgrim's garment" , "White garb of Muslim pilgrims to Mecca" .)