How to Stitch on a T-Shirt....

Use a ball-point or round-end needle to avoid pulling and stripping the woven material of the t-shirt. Tapestry or count-cross stitch needles work well. These needles are more likely to find their way through the woven structure of the fabric without holes being threaded.

As with any embroidery, it is important to start and finish your t-shirt embroidery well, especially because you do not want any type of stitching after washing. Tying the knot may result in stretchy fabric being pulled and the design deformed. Securely knit at the end your embroidery looks beautiful.
If you are such a fine embroidery, be careful not to pull stitches too easily. Stabilizer will help prevent this, but you should not just rely on it.

Remove the stabilizer
If you use a stabilizer that you have best fitted, remove the stitches by cutting the thread and dragging the stitches.
For tear-stabilized stabilizers, spread the entire edge over the embroidery.
Then, remove the pieces from the inside of the embroidered design, being careful not to interrupt the stitches.
When using a water-soluble stabilizer, remove the excess stabilizer from the edges before soaking the embroidery in hot water. Press the T between two towels to remove excess water and hang dry.
Gently iron your finished embroidery to smooth out any shocks and remove the hoop marks.
Ready to wear your embroidered T-shirt.