How to measure Pants ?

For women and men - all Leggings, Bermudas, Shorts, and Pants:

All pants can be adjusted in width & lengths.
For all precise measurements (inches or cm) I advise you to use your own best fitting pants as a model.
A = ... ? across beltline
B = ... ? OUTSEAM - from the top belt line to the end of the leg. Or from where your pants saddle your waist (belt line), down to your ankle or a bit below even.
Pls refer to the Video below. How to measure your pants width and the Outseam ?