I submitted a provisional patent for a bra sizing system that goes off user measurements in the metric system (for more precision), uses measurements transparently, allows for a third measurement to distinguish chest versus breast, and has sister sizes that don't drift an inch with every step.
So my measurements:
Above bust - 91 cm
Leaning bust (at 90deg from upright) - 97 cm
Under bust - 77 cm
Would translate to a standard size of:
77 +20 (or 77 : +20, colon optional but useful if a brand finds itself offering negative sizes)
Or an enhanced size of:
14+ 77 +20 (or 14+ : 77 : +20)
Immediate sister sizes would be:
15+ 76 +21 (down in under bust or base metric, up in above bust or frame metric, up in leaning bust or cup metric)
13+ 78 +19 (up in under bust size, down in both above and leaning bust sizes)
Obviously this doesn't address all the issues we have with bras, but it makes it a lot closer to a user based system that is universal between brands (instead of having you add 0-5 inches to your bust or above bust and wondering what size difference the letter actually corresponds to). For issues with closeness/wideness, breast root width, and other factors, manufacturers can publish that data and be transparent to their customers.
If you know of any bra makers or companies who would like to add this to their sizing offerings, please let me know!
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