Final character of garment badly treated? (8)

I believe the answer is:
tattered
'final' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
'character of garment badly treated?' is the wordplay.
'character of garment' becomes 't' (I can't justify this - if you can you should believe this answer much more).
'badly' indicates an anagram (letters in the wrong order).
'treated' is an anagram of 'attered'.
't'+'attered'='TATTERED'
Can you help me to learn more?
(Other definitions for tattered that I've seen before include "Old and torn" , "In rags" , "Worn to shreds" , "Ragged and threadbare" , "In poor condition" .)
