This Wicked fan art contains
fedora, cappello di feltro, homburg, stetson, and stetson trilby.
There might also be
paglietta, livorno, panama, cappello panama, marinaio, skimmer, il cappello di paglia, cappello di paglia, cappello di vestito, alto, cappello opera, cappello di seta, stovepipe, cappello a cilindro, topper, castoro, vestito, cappello, cappello alto, opera cappello, aggrovigliati, and top hat.
Dianne Pilkington discusses her costume changes in playing Glinda the good witch in Wicked. This involves nine costume changes, but only seven actual different costumes. V&A Theatre & Performance Dept.