Neville, I also have always thought that having a hechsher for shatnez on clothing would be great, and the situation we have now is like it used to be years ago with food when people just read the package labels and ate it if they did not see any obvious non-kosher ingredient.
I think though that it’s because every piece of clothing can be different, if they run out of material, they can use any scrap so one jacket by manufacturer A would be ok, and another not. It’s less uniform than food. You would need a mashgiach in the clothing factory to check all the materials present and make sure the wrong combination is not used on the entire product line. You would also have a hard time convincing clothing designers to pay for supervision- the frum clientele is too small to make it worth it, while kashrus has a wide appeal even among the non-frum since people assume it means better quality.
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