1. Take measurements using a soft tape measure.
  2. Measure bust, waist, and hips.
If you are in between sizes, we recommend sizing up for a better fit. Especially for tops due to the inserts and using IBTC sizing vs. traditional companies who size on 36C. We’re all about IBTC sizing here!
SIZING TIP: Size up in the Seaside top from your normal bikini top. Montauk runs true to size. 

    Montauk (Underwire) Top Fit


    Size  Bust Size (in) Bust Size (cm) Underbust Size (in) Underbust Size (cm) Cup Size
    XS 28-31 72-80 25-28 64-72 AA-A
    S 32-35 82-90 29-32 74-82 A-B
    M 36-39 92-100 33-36 84-92 B-C
     L 40-44 102-112 37-41 95-105 B-C

      

    Seaside Triangle Top Fit


    Size Bust Size (in) Bust Size (cm) Underbust Size (in) Underbust Size (cm) Cup Size
    XS 28-31 72-80 24.5 62.2 AA-A
    S 32-35 82-90 25.5 64.7 A-B
    M 36-39 92-100 27 68.6 B-C
     L 40-44 102-112 29 73.7 C

    Bottom Fit


    Size  waist size (in) waist size (cm) hips (in) hips (cm)
    XS 24-25 61-63.5 34-35 86.5-89
    S 26-27 66-68.5 36-37 92-94
    M 28-29 71.5-74 38-39 96.5-99
     L 30-31 76-79 40-41 102-104 

     

    One-Piece Fit


    Size  Bust Size (in) Bust Size (cm) cup size waist size (in) waist size (cm) hips (in) hips (cm) torso (in) torso (cm)
    XS 28-31 72-80 AA-A 24-25 61-63.5 34-35 86.5-89 58-59 147-150
    S 32-35 82-90 A-B 26-27 66-68.5 36-37 92-94 59-60 150-152.5
    M 36-39 92-100 B_C 28-29 71.5-74 38-39 96.5-99 60-61 152.5-155
     L 40-44 102-112 B-C 30-31 76-79 40-41 102-104 61-62 155-157.5
    Size Chart