Sew a robe style Kimono

I would like to get a simple triangle designed Kimono made for cutting hair. Easy for clients to put on and take off. I like the design of the attached file but need to change the neckline so it somehow sits more closed around the neck, not as high as grandpa collar but similar. the back needs to be clean with no wraparounds etc..as It would need to have neck size options ie buttons. Length- between knee and ankles Size- if possible one size fits all. Belt- i would like the belt thicker than the picture. Colour- black for now Material - some type of matt satin or similar that hair will slide off from, something that does not need ironing. I would like a quote with material supplied and without please Quantity- once we are happy with design, i would like a quote for 10-100 please