The Men's Front Carry Concealment Shorts by UnderTech Undercover were designed because of the number of requests. They feature a holster with a retention strap in the front ‘Appendix Carry’ position.
Per UnderTech Undercover: “The Concealed Carry undershorts are intended for everyday wear and to replace your existing undershorts with a concealed carry option. They are perfect for anyone who wants to discretely carry a self-defense handgun. If you're an executive who needs to carry, an emergency room doctor or nurse, delivery person, store owner, realtor....this is a perfect way to carry concealed. It's also perfect for those who work out -- runners, walkers, bikers, etc -- because you can carry securely without a big belt and holster and the extra pocket will hold your keys, cash, and credit cards!”