Quote Originally Posted by Muirenn View Post
4. You were measured for sitbones at the shop? I've heard of a couple of people doing that, then trying at home and discovering the shop was off by 30 mm. Perhaps try this at home just to double-check?......
I am one of those people and they were off quite a bit. Nothing wrong with checking for yourself just to be sure - personally I found the play-doh method (making your own with flour, salt and water) to be simple and effective. Also easy to read afterwards

There are whole threads here about difference methods check your sit-bone width - here is a good one but there are plenty of others.