Apron
Seeing your favorite anime character trade their battle armor or school uniform for a simple apron is very heartwarming. It hits that sweet spot of home happiness, letting you know right away that it is time for some home-cooked food or some cleaning. This tag includes everything from the classic frilly white pinafores that you see in maid cafes to the practical, solid-colored ones that waifus wear when they make breakfast. In anime culture, it is the most important sign of care and service.
You can see a lot of different styles here. You have the professional maid look, which shows like Maid Sama! and Miss Kobayashi's Dragon Maid made popular. The apron is part of a strict, fancy uniform with lace and ribbons. Then there is the more laid-back "slice of life" feel, where a character just throws one on to keep their shirt from getting curry stains. The difference is what makes it work. Seeing a tough tsundere or a cool magical girl suddenly look like they belong at home adds a layer of depth and cuteness that fans love.
We can not talk about this tag without bringing up the well-known "naked apron" (or hadaka apron) trope. It is exactly what it sounds like, and for good reason, it is still a huge sub-genre in fanart. The apron is a versatile accessory that can change the mood of a picture, whether it is a wholesome cooking scene or a spicy fanservice scene. It says "welcome home" in the best way possible.