New Pattern Day! It's like Christmas, except a lot more often.
Butterick has several interesting additions to their pattern line-up.
B6093 - This dress has an Edwardian/1910s feel to it, though I think it could work for steampunk with all that lace and the sleeve detail.
B6108 - Now this is DIRECTLY 1910s, Titanic era fashion. I think the anniversary of the start of WWI is inspiring interest in these looks. BUT again I think this could be very interesting incorporated into a steampunk ensemble. At the very least, it's definitely dieselpunk.
The next pattern is pretty clearly aimed at a Halloween/Renaissance festival audience, but it has some promise.
B6114 - The pattern includes two versions of a short chemise, a short, feminine pirate coat, and an underbust "vest" bodice.
I actually find the individual pieces pretty appealing. The long-sleeved chemise is pretty and I like the coat. The "vest" is probably perfect if you're looking for an underbust style bodice. Just please wear a bra with it and don't call it a corset. ;)
B6113 - This one is very costume-y but I thought I'd include it for completeness. It's really just a princess dress for all ages, but I can see someone call it steampunk, since it's definitely not historically accurate. I think it could be made cool, but mostly looks cheap.