After Wendy and Chelia's fight, this is basically nothing, so don't feel too bad
ALSO! THEORY CRAFT: Zirconis is a Zirconia Jade Dragon, so his magic is the inverse of a regular Jade dragon. Based on spiritual meanings, the Jade Dragon would have buff spells, as would his dragon slayer (much like how Wendy is a heal dragon). As a result, Zirconis, being a reversed version of a Jade Dragon, would therefor be a DEBUFF dragon. So his removal of cloths is just taking debuffing the opponent to the natural conclusion, full on armour destruction.
Alternate Theory: Zironis is taking "Buff" a bit too literally here.