Irish Shamrock Tie Tuxedo Baby Onesies. Now everybody in the family can dress to impress this st. Patrick's day! Our Irish Shamrock Tuxedo Infant Onesies looks as great as our Best Selling, World Famous tuxedo t-shirts. Now even your baby can get in the Irish Spirit at your next get together! They will be so cute buttoned up in this super comfy 100% cotton onesies!