The Irish Honor System is totally a thing. Show your support for Mac’s system as you serve yourself a pint from Paddy’s Pub with this It's Always Sunny in Philadelphia Irish Honor System Adult Short Sleeve T-Shirt. A comfortable classic, this tee is a must-have for any fan.

• This is the perfect tee to lounge around in!
• Fit: This crew neck shirt is comfortable and lightweight.
• Made of: 100% Combed Ring-Spun Cotton and 90/10 Cotton/Polyester in color
• Care: Machine wash cold inside out with like colors and tumble dry low.
• Additional Information: Its design is drapey and easy to wear on the go or while lounging at home.