Shamrock Celebration. Dress your best this St. Patrick's Day with the help of the Shamrock Knee Socks. Complete your head to toe St. Paddy's Day look with fun, shamrock footwear. Dress to impress with green and white knee socks for a St. Pat's Day look they won't forget! One size fits most. Shamrock socks are approximately 18 1/2 long. Machine washable socks. St. Patrick's Day costume accessories are must haves for a fun and memorable event. Stock up on the St. Paddy's favors, supplies, and accessories you need to make your shamrock event a success! Part of Holidays > St. Patrick's Day > St. Patrick's Day Accessories 1 pair of socks per package. One size fits most. Shamrock socks are approximately 18 1/2 ″ long. Machine washable socks.