That's a beautiful dress 
. I've been looking at that site myself, but I only looked at the wedding dress section, didn't think to look in other sections.
I think you were wise to go for a medium, I've ordered from a few Chinese outlets on ebay and a Small is always tiny by Western standards!
Do be aware that with these Chinese companies, you may get stung by tax on arrival. I ordered from a different company but also based in China, but I know that I will probably have to pay tax on delivery but I've factored that into the cost and it still works out much cheaper than buying a dress over here, even if you have to pay for alterations as well.
I've looked into reviews for different Chinese wedding dress companies and the ones for LITB seem mixed, I think many people complain because they didn't realise that they had to pay import tax and the returns policy, but there are just as many happy customers too.