I know brands such as Oska, Nygårdsanna and Studio Nicholson offer similar, but I struggle to locate such items in the UK. I certainly can't afford to pay higher end prices but can afford the occasional bit from the Toast/Howell end of the price scale.
I have seen similar threads here in the past where people insist that you have to be 6 foot tall and shapeless to carry this style off, but I strongly disagree, since so many (perhaps the majority) of the inspiration images show Japanese women, or short and curvy women looking fantastic in it. Perhaps it is our western predilection for amazonian models representing the 'default' for all clothing styles? A matter of perception?
I am 5'4, so not petite, and have longer legs for my height. My body type is very similar to the Japanese ladies in these images across the internet, but I have no real idea how to pull it off - but would love to try! I am half way there, but never dive fully in 
Also, if this style appeals to you, I would love to know how you have your hair? I think how we wear our hair is integral to our overall sense of style, whether we invest ££ in it or prefer to go with the natural flow. We talk a lot about different aesthetics in S&B but rarely discuss the hair when we talk about outfits, etc.
I suppose this is similar to the 'monty don as a woman' question, but maybe a bit less less boxy/utilitarian and more silky/fluid?