PLEASE READ NOTES BEFORE ORDERING!
NOTE: There is no "built in bra" in the one piece suits!
That said, I found that a size L kept me held in WELL (even in the water) when I was a 38D.
I am 5'7. When I was a size 12/14, I would wear a size L or XL. Currently I am more of a 8/10 and would recommend a size M for someone my size.
I would suggest the smaller size if you're around my size and like to feel "held in" by a bathing suit, plan on being super active in the suit, or if you do lots of swimming or chasing little ones around. I would recommend the larger size if you are more of a poolside "lounger" or prefer a less "held in" feeling from a swimsuit.
If you are still skeptical, I did try ordering this swim bra and it definitely added more support. I don't feel like I personally needed it (it felt like overkill for me personally) but just offering this as a creative option for those concerned:
https://www.amazon.com/gp/product/B08WPGK52F/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
• 82% Polyester, 18% Spandex
• Fabric weight: 6.78 oz/yd² (230 g/m²), weight may vary by 5%
• Chlorine-resistant fabric
• Cheeky fit with a scoop neckline and a low scoop back
• Zig-zag stitching
• Double-layer front
• Four-way stretch material stretches and recovers on the cross and lengthwise grains
Size guide
CHEST | WAIST | HIPS | |
XS (inches) | 33 ⅛ | 25 ¼ | 35 ⅜ |
S (inches) | 34 ⅝ | 26 ¾ | 37 |
M (inches) | 36 ¼ | 28 ⅜ | 38 ⅝ |
L (inches) | 37 ¾ | 29 ⅞ | 40 ⅛ |
XL (inches) | 41 | 33 ⅛ | 43 ¼ |
2XL (inches) | 44 ⅛ | 36 ¼ | 46 ½ |
3XL (inches) | 47 ¼ | 39 ⅜ | 49 ⅝ |