Locust Antennae Mask Headgear
How to Obtain
Rarely dropped by 
Grasshopper Guai.
The Verdure Bridge shrine in the Webbed Hollow is a good farming spot - a grasshopper guai is guaranteed to jump out of one of the nearby cocoons.
Effect
Considerably increases power of all Jump Attacks.
Screenshot
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such an annoyingly low drop rate
It really is :( keep at it, though - statistically, it's just a matter of time until it drops :D
(and maybe equip the Golden Carp curio to increase the drop rate!)