Drew on unknown English hippy's clothing, possibly? (3-3)
I believe the answer is:
tie-dye
'hippy's clothing possibly?' is the definition.
(tie-dye design is associated with hippies)
'drew on unknown english' is the wordplay.
'drew' becomes 'tied' ('tie' can be a synonym of 'draw').
'on' says to put letters next to each other.
'unknown' becomes 'y' (algebra).
'english' becomes 'e' (abbreviation).
'tied'+'y'+'e'='TIE-DYE'
(Other definitions for tie-dye that I've seen before include "Colour fabric" , "Colour by a particular method" , "Method of colouring garment in which it is knotted" , "Stain by knotting fabric to produce an irregular pattern" , "Hand colour textiles" .)