Sit bone measurement never worked for me. I've tried just about every saddle you can think of. More important than sit bone width for me is saddle profile/shape. A 142mm wide saddle that has a domed shape does not have 142mm of available real estate. I've found that a saddle with no more than 10mm of padding and a flexible shell works best for me. WTB saddles IMO are the worst out there they run too narrow have too much padding and a ridiculous transition from top to sides very square. When you find the right saddle you'll know it, the right saddle IMO is one that I can get on even after being off the bike for weeks and not have any discomfort. My current saddle is a Fizik Antares R3 large 152mm wide and a flat but not too flat profile 7mm of firm padding and a carbon nylon shell that flexes. I can spend all day on it with no issues. One of the most important aspects of the right saddle is one that you are able to sit squarely on your sit bones. Too much padding has a tendency to restrict blood flow and compress nerve endings leading to discomfort. This is such a subjective topic and trying to find that goldilocks saddle can take a lot of time, keep trying different saddles you'll eventually find the right one. Another saddle that I find comfortable is a Brooks Cambium it's a rubber nylon shell with material bonded to it and zero padding but it has a large amount of flex and is kind of like a hammock for your ass. Only downside is they are heavy AF.