The method with jeans is to rub something rough against the areas you want worn to holes until that effect is reached. Rinse and repeat.
For shirts and jeans that you want a particular holey look, as in the image above, I suggest the follow technique:
Put whatever item you want fashionably destroyed next to a rat cage, leave for a bit and totally forget about it. Then come back and scream for a bit while you try to extract your clothing item from the jaws of hell. Holes will range from large gaps to small, pointilist effects.
Super, like totally fashionable clothes cost the earth. Rats cost around R5 - R30, it's renewable energy and leaves no carbon footprint.