BoM means that classic layer clothes (and skins and tattoos etc.) are "painted" onto any BoM-enabled mesh body just like onto the system body. Generally, BoM-enabled mesh bodies support the standard Second Life UV mapping, so you can take a brand-spanking-new Legacy Perky mesh body and wear old FleepGrid shirts or Linda Kellie jeans on it.
The only limitation is that layer clothes can't change the shape of a system body. For example, if you put layer bell-bottom jeans (with the bell bottoms not being prim or sculpty attachments, but part of the jeans themselves) on a mesh body, they will become skin-tight jeggings because they cannot re-shape your lower legs into bell bottoms.
Also, SLUV is outdated for heads in SL and from SL now. The SL mesh head maker LeLutka has defined a new UV mapping "standard" named EvoX that increases the resolution of the skin especially on the face. The downside is that classic SLUV skins are incompatible with EvoX heads, and EvoX skins are incompatible with pre-EvoX heads as well as the heads on any and all legal BoM-enabled mesh bodies (Ruth2 v4, Roth2 v2, Remmy Ravenhurst's Ruth 2.0 RC#3 BoM conversion, LuvMyBod with one of the BoM add-ons, Diana...). This does not affect the actual body, though, because the texture mapping on the body has never changed, because it has little room for being optimised. The system body (with an EvoX head) can wear EvoX skins, and a brand-spanking-new SL body (with a non-EvoX head) can wear old Eloh Eliot skins.
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