Love these boots and would wear them in a heartbeat! I wear a 6.5 and take a UK 4 in Docs. I find their sizing very consistent and once I knew my size had no trepidation about ordering online.
SoftMoc carries Docs so you might want to try on a pair or two there to be sure of the size. There is also a Canadian website unionjackboots.com that is the Doc Martens Canadian online store. You may want to check if they have these boots there to avoid the exchange/duties. I ordered two of my Docs from there and was pleased with the price and service.
I wear my Chelsea style boots with skirts, dresses and pants and find them very versatile.