If you manually delete an Outfit collection (Delete Hierarchy in the Outliner), some Orphan data (data that are not available on the scene but can still be found in the file, for instance from the Blender File mode in the Outliner) might still be around, affecting performance and increasing the size of your file. There are several ways to remove Outfits from the scene, using MustardUI, without leaving these Orphan data around. Clean Model: if you plan to use only one Outfit, and you already selected Extras and Hair in the MustardUI, you can use the Clean Model tool to remove all other outfits. Check the Documentation for more informations about this tool. Delete Outfits with right click: if you want to remove just some Outfit collections, enter configuration mode from the Settings panel of the MustardUI, and then right click on the collections and use the Delete Outfit button. Note that Remove Outfit just delete the outfit from the UI, but keeps the Objects in the scene. Delete Outfits from the Outfits list: if you want to remove just some Outfit collections, enter configuration mode from the Settings panel of the MustardUI, and go to the Outfit section. There is a list of Outfits available, with two buttons. The X button will just remove the Outfit from the UI, but keeps the Objects in the scene; while the \\"trash icon\\" button completely deletes all Objects in the Outfit collection from the scene.