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Size 34DD Bikinis

A 34DD is the point where a larger band meets a noticeably fuller cup — a size that feels "in-between" in standard retail but is absolutely your actual measurement. Generic bikinis sized by medium or large leave you struggling: the large doesn't have enough cup depth, and the extra-large band is loose and uncomfortable. A true 34DD bikini top is engineered to acknowledge both your band measurement and your cup volume, giving you the support and shaping that only proper sizing delivers. When your swimwear fits your actual size, you feel confident and comfortable in the water.

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Save $18.00Pour Moi Cali Recycled Hidden Underwired Top PM26401 Ocean Blue Front
Pour Moi
Pour Moi Cali Recycled Hidden Underwired Bikini Top PM26401 - Ocean Blue Sale price$54.00 Regular price$72.00
Save $19.00Pour Moi Free Spirit Strapless Underwired Bikini Top PM13202R Aqua Tropical Front
Pour Moi
Pour Moi Free Spirit Strapless Underwired Bikini Top PM13202R - Aqua Tropical Sale price$57.00 Regular price$76.00
Sunsets Vienna V-Wire Bikini Top 530 Aloha Vista Front
Sunsets
Sunsets Vienna V-Wire Bikini Top 530 - Aloha Vista Sale price$104.00
Sunsets Pacifica Black Oceana Bikini Top 574 Black Pacifica Front
Sunsets
Sunsets Pacifica Black Oceana Bikini Top 574 - Black Pacifica Sale price$98.00

What to Look For in a 34DD Bikini Top

At 34DD, construction matters more than size alone. Look for bikini tops with multi-seam cup designs that provide shaping from multiple angles and prevent bulging or sagging. Underwired or molded styles work best because they provide the internal structure that keeps cups from collapsing or gaping. The band itself should measure true to 34 inches with minimal stretch; any give will shift under the weight of your cup. Reinforced side seaming is essential to prevent spillage at the sides. Avoid strapless or minimal-support styles at this size — they lack the engineering a fuller cup requires. Choose styles with full-cup coverage rather than balconettes or half cups, which can create spillage at the top.

Cup-Sized Bikinis, Curated by Fit Experts

At The Bra Diva, we carry bikinis the same way we carry bras — by actual bra size, not just by small, medium, or large. Every style in this collection is selected for its construction quality, true-to-size fit, and ability to hold up in and out of the water. Our team has been fitting customers since 1987 at our Cherry Hill, NJ boutique, and we bring that same expertise to every size we carry online.

Shopping for more styles in size 34DD? Browse our Size 34DD Swimwear collection, or shop Size 34DD Bras for everyday lingerie in your size.

Not sure if 34DD is your correct size? Use our bikini size chart →