Boy's and Men's T-Shirt Patterns from Jalie Patterns. This pattern makes fitted t-shirts in 27 sizes for boy and men. Jalie Patterns recommends that you use a knit fabric with 40% stretch when sewing these t-shirts. Choose from short, long, and double-layered sleeves and crew or v-neck. The Boy's and Men's T-Shirt Pattern can be used to make long underwear and thermal jackets depending on the material you choose.