A company from Slovenia called NV created an accessory named t holder: A band placed around the thigh with fasteners that hold the shirt for it not to “run away”. It works like a garter belt, but upside down.
Used in both legs, each elastic involving the thigh has three more elastic with clips holding the shirt. The material was developed with comfort and discretion. With the shirt attached by clips, you can raise your arms without the skirt pants shirt or lower without underwear (or caddy) to appear.
The product is still in the fundraising stage. Until mid-April you can support the project and ensure t holder firsthand through Kickstarter. The forecast is that the male shirt enhancement starts to enter the market from June this year. So far the project has been very well received.