A worn oilskin cloak protects you from the amnesia effects of Lethe water.

Wearing an oilskin cloak prevents theft attacks by nymphs, monkeys and leprechauns.

Oilskin cloaks prevent you from getting entangled in webs. Greased cloaks do too, but the grease may wear off in the process.

Oilskin cloaks should be MC3 instead of MC2.