I'm not awesome enough to understand modding, but I can't help feeling that this (and the other 3 related threads you've started recently) are related to an issue I had and reported
here.
In my case the sims I had problems with looked as if they were wearing "everyday" wear, however the game didn't realise they were wearing "everyday" wear. I had these errors only on my first rotation through the neighbourhood. Resetting through multiple errors until I could place a wardrobe next to the sim and order it to change into "everyday" worked to fix the problem for that sim, and once all borkened sims in the family were fixed, there were no further problems for that household. Since then I've had a couple of rotations through the neighbourhood, and not had a repeat of these errors. (Although I haven't had any vacations in that neighbourhood yet).
From my totally unawesome perspective (so I could be completely wrong here), I don't think warmthfixes or BUY is the cause of the game not recognising that the sims are in "everyday" wear. I suspect this is an EAxis glitch. Since the game isn't recognising that these borkened sims are in "everyday" wear, any mod that tries to determine what type of outfit the sim is in (such as warmthfixes or BUY) is going to error.