These are the Nichola Pants from Burdastyle. If you haven't checked out Burdastyle, do so now. Many free patterns to download and print out. It's not a vintage pattern, but reminds me a lot of the type of pants Katherine Hepburn and Marlene Detrich wore, so I'm posting them.
Should you be interested in making these pants, I reccommend reading the reviews on Patternreview.com and looking at the ones other Burdastyle members have made, as the pattern seems to run large. Also, I found by wearing them a few times that the crotch curve is a touch short. I blogged about them here.
