Listen Flavor is really cute Japanese clothing brand that does lots of comfy casual clothes perfect for Fairy Kei, Yume Kei or any other pastel based fashion style! (They also have lots of black clothes too that are super cool if you are more into that!) They make adorable prints, some of their own and some collaborations with others, like Sanrio for example. They have both simple printed t-shirts and oversized cute sweaters with sailor collars.
I just love their designs so much and they are really comfy. On top of that its a pretty affordable brand, of course you will have to pay shipping and customs fees as always though. They have pants, skirts, dresses, sweaters and anything else you would need. You could build your whole wardrobe from this brand only.