Nosotr@s has a great St. Pat's outfit that includes a shamrock-pattern shaved hairbase and mohawk, with a matching set for the ladies.
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Scene: Cleo Design, Timeless Treasures Hunt prize
Pot of Shamrocks: Giardin Na Sidhe Midnight Mania board
Yo-Yo: [A;B] Accessory Bone red yoyo, 81L Sale
Shirt: Gimme Shelter Irish O'Snap shirt (free on Marketplace)
Sweater: DAMnations Freddy green, Pot of Gold hunt
Outfit: Nosotr@s St. Patrick's outfit, 3L