Bra fitting : why are companies still 'adding 4'?

The bafflingly prevalent +4 method of fitting bras (of deducing back size by measuring the underbust and adding four or five inches) is a relic from the very beginnings of the modern bra. The old, stiff materials used simply didn't have enough flex for details like breathing, and the 'right fit' came from underbusts four…

I posted a list of brands that sell lingerie, swim & sportswear

I do not know which bra cup is suitable for me, my under burst is 40 inches and my upper burst is 47 inches, so what bra size is best for me? - Quora

What is my bra size if my band is 31 and my bust is 35? - Quora

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What bra size do you think I am? My underbust is 31 inches and my overbust is 36 inches. (I just want to know your thoughts- Some tell me I'm AA and

How many inches does one lose when going down one band size on a bra? - Quora

What are band sizes on bras, e.g. 32B? I don't get the band sizes. Does it mean that under my breasts are 32 inches not including the cup? - Quora

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I measured my band to be 26.5” and my bust to be 29.5”, what in the world is my bra size and where can I buy inexpensive bras? - Quora

What is my bra size if my band measurement is 36 inches and the overbust measurement is 43 inches? - Quora

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