Weisheit

Hi, you have done, in BLENDER when you export, in the export menu, it will show one Armature Options->Export for OpenSim

<- old reply account i never used It can be 1 of 2 thing, maybe scripted in world rez appearance, unlikely. Or maybe it is saved joint positions. If it is joint position I do not support it's use for something like clothing, it can clash with other outfit parts using joint positions. Wear enough and your animations will twitch every few second. Go T pose as much as you can! If it is not either then I do not know