first off, all of the DAZ figures use Joint controlled morphs, (V4 Uses Magnets for this purpose for some of those, but those dont necessarily all transfer over to the clothing perfectly so I still find some jcms are necessary to fix those issues) so in order to avoid pokethrough you pretty much have to create jcms in the clothing to match those morphs if you want to avoid pokethrough.

as far as should pokethrough be acceptable in commercial clothing, I cant speek from experience with any other store but I know DAZ tests for pokethrough and fails anything that has pokethrough when using stock poses with limits on, though they do allow for adjustment morphs if necessary, but every store is different in what they allow. personally I like to see that the merchant makes every effort to avoid pokethrough in their clothing exept in extreme conditions such as limits off posing. I provide JCMs in mine as well as usually providing some general adjustment morphs to loosen the clothing in order to more easily accomodate more extreme poses, and base figure morph combinations. I think it is acceptable to provide hide poses to hide bodyparts on the base figure that wouldn't be seen under the clothing but than that limits texture artists from being able to use transmaps to hide or make translucent parts of the clothing.