The 30E bra has a bigger band than the 28E bra. The 30E bra has deeper cups than the 28E bra, but they are about the same width.
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SuperBra Tango II Underwire Balconnet Bra
28FF - Cleo » Blossom (10581)
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Asher Underwire Balconnet Bra
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Comparing a 30E with 28F in Panache Envy Balconnet Bra (7285)
Panache Superbra Tango II Underwire Balconnet Bra 3251, Underwired Balconnet., Features fine mesh with an elegant embroidered leaf design., Gives
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Bras I Hate & Love: What Does Panache Have to Offer? (Brand Overview)