The only way I know of currently to do that would be through changing the sprite's name as it is recognized in LeTBS. You can do this by creating a state for example with the tags:
Code:
<letbs>
sprite_name: Dragon
</letbs>
and having your designated sprite sheets match the name. You might be able to perform similar functionality with Yanfly class change core.
Unfortunately, as far as layered sprites go, I do not see an easy solution and have not seen anyone in this thread mention that they have gotten this working either. Meaning the only solution is to have numerous different sprite sheets and poses for each outfit you wish to give your units.
Maybe there is a plugin out there that no one has tried yet with LeTBS that can do such a thing. It would be nice, but as it stands I do not believe there is one that anyone here is aware of or has found.
To be fair, this thread was most active +2 years ago, so it is entirely possible that there have been plugins or techniques found or created since that are compatible with the way LeTBS handles sprites and poses, but something tells me that you would need to go deep into the JS code itself and replace the entire way LeTBS handles sprites in order for this to work.
The only other solution I can think of, and it may or may not be an elegant one, would be to use MV's
pictures to apply an overlay of the graphics you want on the sprite, and have it positioned to the x and y coordinates of the actor in question. Using a HUD type program could do such this, but it would require some JS knowledge to do so, and I question if the x,y positioning would be uniform with the way sprites move. As in, it would probably work, but it may look awkward when moving or during lag/heavy load times.
I would search the forum for keywords such as "picture overlay sprites", I am sure there is something out there that can do this at the very least.
Something like this for example:
https://forums.rpgmakerweb.com/inde...ite-over-character-on-map.142553/post-1232672
Note, I have not tested this with LeTBS.