What advice seems obviously right, is relatively easy to follow, and is usually ignored?
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NOT relatively easy for females, unless you happen to be shaped like the "fit model" Very expensive and time-consuming proposition to find things that fit, and then if you gain or lose 5 lbs, you're back to square one and out however many $100s you spend on the last round...
Granted, the failure of the women's clothing industry to use standardized sizing must be infuriating. It's a weird market failure.