Close-fitting leotard I modelled (8)
I believe the answer is:
tailored
'close-fitting' is the definition.
(tailored to a particular customer)
'leotard i modelled' is the wordplay.
'modelled' indicates anagramming the letters (I've seen 'model' mean this).
'leotard'+'i'='leotardi'
'leotardi' with letters rearranged gives 'TAILORED'.
(Other definitions for tailored that I've seen before include "(Of clothes) fitted, well cut" , "Adapted" , "Fitted, well-cut" , "Suited to an individual" , "Made to measure for idolater" .)