How should a guy stand up straight without shirt rising?

Question

Whenever I try to stand up really straight to look as tall as possible, my shirt goes up and it looks as if I had small b*****s or something. I am not fat at all, but this always happens. A good picture example would be this. Note: I think mine are more noticable than the guy in the picture.

http://images.starpulse.com/Photos/Previews/Zac-Efron-hsm01.jpg

http://www.nypost.com/seven/06132007/photos/news017a.jpg

How should I stand so that my chest looks flatter, but still look tall? Like this person here:

http://www.hdclothing.co.uk/hdconcept/male/teesmale/replay/replay%20rockville%20tshirt.jpg

Thanks!

Answer 1

Darker and thicker shirts and keep your shoulders tilted slightly forward I believe will help make it so there aren't any "bumps" on your chest that will be seen.  Gl =3

Answer 2

ive never even noticed that about diffrent guys? lol umm yea darker shirts dont show "bumps" or creases....but idk ..never noticed and thats all i can think of to do?