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@velodrama.co.uk
Ok, your sit bones (pelvis bone) taper inwards towards the front of your body a bit like \ /, so, the further leaned forward you sit on the saddle the narrower the seat you need to support your sit bones, and not get in the way of your legs for pedalling. We add 2cm to he actual distance so the sit bones sit on the saddle and not the outside of it.
Easy to measure, sit on a sheet of corrageted cardboard with your back straight, nothing in pockets, lift your heels off the ground and with your hands pull yourself into your seat - the idea is to make an imprint of your pelvis (sit bones) in the cardboard (tricky for women cuz we have padding!). When you have made an imprint draw a cross in the centre of each imprint, get a ruler and measure the distance. Add 2 cm for a fixie riding position and you have your saddle size. The idea is that your sit bones sit comfortably on the saddle and supports your hips, not your lady/man bits trying to support your body.
For a sit up and beg style you could add up to 4cm because you re using the widest part of your pelvis.
Hope that makes sense :)
Take a tape measure with you when you buy a saddle and measure the distance between the two parts of the saddle where you should sit you pelvis and make sure you have enough space for them!