Many times, fine fashion follows new, then not new (8)

'many times' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

'fine fashion follows new then not new' is the wordplay.
'fashion' indicates an anagram.
'follows' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'then' is a charade indicator (letters next to each other).
'not new' becomes 'old' ('old' is the opposite to 'new').
'fine' with letters rearranged gives 'inef'.
'inef' after 'n' is 'ninef'.
'ninef'+'old'='NINEFOLD'

Can you help me to learn more?