It is the outfit by Jingo for their avatars. https://jingo1016.booth.pm/items/2843652

@lolmesu Often eye tracking issues with VRC are issues with the Head bone not being perfectly zeroed out on their X and Z axis (X and Y in blender defaults) and the eyes similar. Open up a booth avatar that works in blender and check out its setup there for example. Could be the problem just something to check.

https://booth.pm/en/items/4390073 Most likely.

Looks like Leefa head to me.