Painfully adorable ring kids!

I've been loving this look for some time now, but am having a devil of a time finding it in the US. This particular outfit was made in England by a very fancy kids designer. Not only is she no longer making this, but the prices are unrealistically high.

Anyone know where I can get something similar? I can find Eton suits, but not with the mandarin collar, which is what I would prefer.