Yep, check the sit-bone separation; some shops have the "Pad" (as I call it), from Specialized, you just sit on it, and the points of your sit bones imprint on the pad, so you can measure.
I don't remember what my measurement was (been over a decade), but I know I can't take anything narrower than 160-165mm. The particular shape matters, too -- I had a Specialized Body Geometry Milano, then a redesigned Milano, then a Sonoma; the last two were 175mm, and didn't do the job. But my present Selle SMP Trk, also 175, is a DREAM!
Recommending saddles for someone else is tough, as everyone's body shape is different. But you have my experience to accept/reject as you will.