Without treading on toes, or jumping down throats, a better way of getting to the cause of any problem is to ask for and provide more detail. Since safely navigating these forums can be at least as difficult as learning Poser intricacies, casting aspersions may be good for fertilising the flowers, but rarely moves an investigation forward.

@Navim, can you show us a screen capture of the library with the material you were trying to apply to the LF catsuit figure? Is it originally intended for that catsuit or some other figure's catsuit? As has been explained, figures created by different vendors will most likely use different material names for their clothing parts. Applying an MT5 material, which only applies to the currently selected material in the Material Room, can be an easy way to get around such naming convention problems. The message you saw "Material blah does not exist. Create" is both helpful and unhelpful at the same time. Helpful, in that it provides a clue that the material file being applied probably doesn't apply to the currently selected figure or prop, and unhelpful, in that just creating that material on the figure still doesn't associate any of the mesh facets to use that material, so another step would be required to make that new material visible. The material room can't directly make that happen. That's what the grouping tool is for.

However, rather than heading down the rabbit hole of endless head scratching that would accompany changing the figure's material assignments, with a bit of effort in the material room, you could, perhaps, make use of the texture you've just applied to a newly created material name. What's required is to copy the material nodes from the new material name, to one or all of the pre-existing materials on that figure, which can be done with one of the material room wacro buttons. But, again, a bit of cleanup will be required, such as removing all of the detached nodes on the other materials, as the wacro leaves them all floating and disconnected (Not completely helpful).

If that gets you where you need to go, great, But if the texture you're applying is actually designed for a different figure, with different UV mappings, and incompatible image files, you may still not get what you want. The concepts are all easy, like going into a shop and saying "I like this suit, but do you have it in blue?", but the mechanisms required within Poser to make that happen may range from trivially simple to "You can't get there from here". Further help will probably need more details on exactly what you're trying to do.

I'd normally post some screen captures of what I'm referring to, but I have a foreground render running and can't get to the material room at the moment.

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