hairshirted

adjective2

1. •
   Wearing a hairshirt.

   • The Gospels, contrasting Jesus with the hairshirted John the Baptist, and placing him with revelers and at dinner tables, […] — 2002
2. •
   (figurative) Humble and penitent; ascetic.

   • Even a hairshirted Calvinist derived pleasure from his righteous self-deprivation: Sacrifice can be its own reward and source of perverse joy. — 2010