There's a big f**k-off seam running from the top to the bottom of the boot, in front of the elastic. I think that's what he means. If they are not leather, you might also have a problem getting the white paint/lethaer dye to stick.
Thanks for sharing Rob but my advice would be to search eBay for "jodphurs" in your size and you will very likely find something in better quality, in real leather, with a very similar shape for around the same price.