I really like to accessorize with items that have more of a Victorian flair to them, since I don't really care for 50's style, either. I'll dress down a 'gothic' blouse by pairing it with something that's comparatively simple, though, like a long chiffon skirt.
I guess if I had to write a recipe, it would be something like:
One or two 'goth' statement piece (jewelry or another accessory–right now my purse has corset lacing on the front, for example, and most of my work shoes are vintage-inspired styles)
A black/jewel tone color scheme (dark green, teal, crimson or wine-purples are my favorites) or, a grey and black color scheme.
Modern young professional hairstyle–pulled back into a bun, curled, or in a braid.
Lowkey makeup–I usually just put on foundation, a bit of eyeshadow (not black, but I really like this one reddish-purple color that, with my complexion, makes me look a bit sickly), and a lip tint that's just a shade darker than my natural lip color.
Professionally done nails. Especially if you're in an office environment where they can be kept in good shape, there's no reason not to. I like a short stiletto shape in either black or dark red.
Don't forget to play around with texture in your outfits, too. Velvet and chiffon are my go-tos, but I won't make an entire outfit out of either, they have to be used in moderation.