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Originally Posted by durannarud |  | | | | | | | | | Many t-shirt design elements are not [...] done in Photoshop or Illustrator... [...] I'm not sure where to start when it comes to imitating wear and tear, discoloration, etc. | |  | |  | |
Some of those effects are actually done in Illustrator and Photoshop - distressed effects are often done at the artwork level using a filter, rather than with washes after the garment is produced for example.
It depends specifically on what you're after.
If you're after a general primer on post-production garment processes such as enzyme washes, etc. I don't know of one (would be a great read though).
Other more artwork specific things will often have been covered or have an easier place to point to; depends on the issue in question.
Other design aspects 
