Use when making our own owned copy of a mergeable's geometry — outfit, hair, ears/tail, or accessory that attaches through a seam (a base's own non-detachable ears/tail/hair is own-base) — so it composes onto a base like a vendor one — "own this outfit", "turn just the clothing/hair into a mergeable", "extract the outfit from a full avatar", "add an MA/VRCFury seam to a bare outfit". Not placing a ready-made mergeable (compose-mergeable), not the base body (own-base), not reshaping alone (reproportion), not a gimmick's animator/param system (own-gimmick).
