Guide] 30H: The shallowest to the most projected cups. Full guide/list is in "Bra Data By Size" section : r/ABraThatFits
Project/Guide] 30FF (US 30H/EU 65H) A comparison of 30 popular bras, which bras have narrow AND projected cups & which bras have wide AND shallow cups (link to full guide in comments) :
Bra Sister Sizes - Sister Size Charts | Bravissimo US
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Bra Sister Size
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Bra size chart – Bra fitting size converter | Bravissimo US
Nessa | Intimates & Sleepwear | Nessa Flores Bra 3hh Uk White Nwt | Poshmark