Possible Clues:

• Ascetic's garb
• Hirsute penitential garment for men
• Penitent's garb
• Traditional wear of ascetic
• Rex in silly Irish hat - one's ashamed to wear it
• A penance that's a shock - right this wrong!
• An irritating habit
• Assumed to be penitent
• Penitential garment
• A penitential garment of hirsute beginnings