Tkieio Kochou Cosplay Costume Kochou Outfit Cosplay Kimono Outfit Uniform Costume Full Set with Wig

What size for a 12 year old

Does it come with a shoe?

The photo appears to show two different capes for Kanao. One has a light design, the other is plain white. How does the costume come?

I am 5'7 and 250 what size should I go with?