I don't know of any steampunk dropshippers at all, let alone European ones, but here's my thoughts on the subject:
Pocketwatches are fairly easy to find from wholesalers, and I'm sure you could find some goggles too. If you get a good manufacturer, they might even plate the frames brass for you to make them look more steampunky, instead of industrial. Clothing should be fairly easy as well, as it's basically just anything old-timey.. For anyone not familiar with the style, look at Steampunk Emporium for a good idea of what steampunk clothes look like.
Random examples of what's NOT steampunk:
And finally a humorous look at what's really not steampunk:
Good luck, and let us know how it turns out... steampunk (when done right) is awesome.