The 36G bra has a bigger band than the 36DDD bra. The 36G bra has deeper cups than the 36DDD bra, but they are about the same width.
Wacoal 851322 Provincial Blue/Angel Falls Instant Icon Lace Underwire Bra –
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Comparing a 36DDD with 36G in Wacoal Sport Underwire Bra (855170)