>>2075870>>2075909I think there's a sense of cuteness or casuality when a girl is wearing a tshirt/hoodie and no bottom. In the case of a tshirt, it's like she's in her sleeping clothes and has just gotten out of bed, and/or is planning on staying in her home all day and not going anywhere. And if the shirt is masculine enough, it's like she just had sex and is wearing her partner's shirt. When it's a (long) hoodie and no bottom, it's like she's planning on going out, but is too lazy to put on proper pants, and is only going to the drugstore anyway, so she just threw on something long enough to cover herself and went out.
Or it could be appealing because although you might not see any private parts if the shirt/hoodie is long enough, you can see a lot of leg, and it isn't a proper way to cover your lower half, so it looks somewhat indecent- and therefore sexy.
Or maybe I'm just over thinking it.