I noticed currently that garters and garter_belt have an implication to lingerie. However, there seems to be many images with garters and garter belts that I wouldn't consider "lingerie" (maid outfits, for one example)
Also kyon_no_imouto implies imouto. While I can see why on this implication, it doesn't really seem like it's very useful for every image she's in to be tagged "imouto". It is particularly odd to have in some, like the genderswap images.
Updated by LaC
