Left side's the inside of the robe, the right the outside. The original was drawn at three times its size, then shrunk down to its current size on MSPaint.

Yes, I feel I failed horribly at the design of the micro riolus robe. It looked a lot better in my head and I felt confident to try and make it. |3 Doesn't help that I felt that it looks like a smartphone case...

Anyway, the robe's a onesie, the hole in the center is where her head goes through. The button folds around to her front, level to around her belly, in which it goes through the two fastener holes(the one level with it followed by the part folding down). In a way, somewhat like a kimono, seeing that the 'sleeves' drape down a small bit from her arms.