I'm new at all this, but I have seen several t-shirts with prints... How do you do that, what programme do you need? I have the delphy's pattern program, but it doesn't work for me

Define prints? If you mean the diffent patterns that you can change on the CAS part, then you do that in-game with the Create A Style Tool. But, I'm assuming you're not talking about that, right?

oh btw, here's tutorial for creating patterns:
http://www.sims2wiki.info/wiki.php?...Custom_Patterns

Now if you're talking about stencils and designs that go on top of a CAS part (shirt design, logo, etc.) then you want Delphy's CAS Texture Unitool

And here's a tutorial for that:
http://www.sims2wiki.info/Sims_3:Cr...othing_Stencils

Thank you so much! I meant stencils and designs, yes.

sweet! thanks for this also.
I was looking exactly for this =D