These clothes are given to members of the Gyobu clan, of which Hayate is a member, when they are recognized as full-fledged warriors. Anyone wearing them is supposed to have the full respect of the clan, though Hayate is something of an exception...
Attributes
[Hayate/Wind-Tanuki Spy-Only Equipment] HP +60, PDEF +12, Wind Res +2, Poison Res +16, Paralyze Res +8