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Very true, a 4 dimensional being with 3 dimensional eyes would be able to look inside closed boxes, and see every side of every object at once. (just like we can see every part of a 2d scene all at once)

Not merely 2d + depth perspective.

If you shop online and use raw measurements, then it will both fit and be available.

The real concern I have is how the large majority of westerners are overweight or obese. That's a serious issue way beyond the practicality of buying clothes