Clothe on game character

Hi could someone tell me, how can I do the T-shirt on my character without script? I try it with " soft body ", but when I do the T-shirt bigger and press " P " to play, the T-shirt is anywhere or is small than i do the T-shirt bigger.

Just use normal mesh for the t-shirt and make it deform with the armature. You wont get any cool physics effects, but it wont be that noticeable.