Chain leggings combined with iron boots.
Said to be the leggings of a Knight of Sunlight from a previous age.
Has no particular powers, but are of fine quality, and evidently well taken care of.
Can be obtained from Pickle Pee in return for a Seed of a Giant Tree (only once per playthrough)
Note that in Dark Souls 3, you do not need to reload to complete the trade. Dropping the item inside the nest is sufficient.