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All About Fit 

Monday is a fit-obsessed brand. Across an array of styles, coverage, and shapes, fit is always the centerpiece of our design process.

Measurements

Monday Size US Dress Size Bust Under Bust UK EU AU
PP 00 30-31.5 24.5-26 00-0 26-28 0-2
P 0-2 32-33.5 26.5-28 2-4 30-32 4-6
S 4-6 34-35.5 28.5-30 6-8 34-36 8-10
S/L 2-4 35-36 28-29 4-6 32-34 6-8
M 6-8 36-37.5 30.5-32 8-10 36-38 10-12
L 8-10 38-39.5 32.5-34 10-12 38-40 12-14
V 12-14 38-39.5 33-34.5 14-16 42-44 16-18
VV 14-16 40-41.5 35-36.5 16-18 44-46 18-20
VVV 16-18 42-43.5 37-38.5 18-20 46-48 20-22
Monday Size US Dress Size Waist Hip UK EU AU
PP 00 22-23.5 34-35.5 00-0 26-28 0-2
P 0-2 24-25.5 34-35.5 2-4 30-32 4-6
S 4-6 26-27.5 36-37.5 6-8 34-36 8-10
S/L 2-4 26-27.5 36-37.5 4-6 32-34 6-8
M 6-8 28-29.5 38-39.5 8-10 36-38 10-12
L 8-10 30-31.5 40-41.5 10-12 38-40 12-14
V 12-14 33-34.6 44-45.5 14-16 42-44 16-18
VV 14-16 35-36.5 46-47.5 16-18 44-46 18-20
VVV 16-18 37-38.6 48-49.5 18-20 46-48 20-22
Monday Size US Dress Size Bust Under Bust Waist Hip TORSO LENGTH UK EU AU
PP 00 30-31.5 24.5- 26 22-23.5 32-33.5 57-58 00-0 26-28 0-2
P 0-2 32-33.5 26.5- 28 24-25.5 34-35.5 58-59 2-4 30-32 4-6
S 4-6 34-35.5 28.5-30 26-27.5 36-37.5 59-60 6-8 34-36 8-10
S/L 2-4 35-36 28-29 26-27.5 36-37.5 59.5-60.5 4-6 32-34 6-8
M 6-8 36-37.5 30.5-32 28-29.5 38-39.5 60-61 8-10 36-38 10-12
L 8-10 38-39.5 32.5-34 30-31.5 40-41.5 61-62 10-12 38-40 12-14
V 12-14 38-39.5 33-34.5 33-34.6 44-45.5 68-69 14-16 42-44 16-18
VV 14-16 40 - 41.5 35 - 36.5 35 - 36.5 46 - 47.5 69-70 16-18 44-46 18-20
VVV 16-18 42-43.5 37-38.5 37-38.6 48-49.5 70-71 18-20 46-48 20-22
Monday Size US Dress Size Bust Under Bust Waist Hip UK EU AU
PP 00 30-31.5 24.5-26 22-23.5 32-33.5 00-0 26-28 0-2
P 0-2 32-33.5 26.5- 28 24-25.5 34-35.5 2-4 30-32 4-6
S 4-6 34-35.5 28.5-30 26-27.5 36-37.5 6-8 34-36 8-10
S/L 2-4 35-36 28-29 26-27.5 36-37.5 4-6 32-34 6-8
M 6-8 36-37.5 30.5-32 28-29.5 38-39.5 8-10 36-38 10-12
L 8-10 38-39.5 32.5-34 30-31.5 40-41.5 10-12 38-40 12-14
V 12-14 38-39.5 33-34.5 33-34.6 44-45.5 14-16 42-44 16-18
VV 14-16 40-41.5 35-36.5 35-36.5 46-47.5 16-18 44-46 18-20
VVV 16-18 42-43.5 37-38.5 37-38.6 48-49.5 18-20 46-48 20-22
Monday Size US Dress Size Bust Under Bust UK EU AU
PP 00 30-31.5 24.5-26 00-0 26-28 0-2
P 0-2 32-33.5 26.5-28 2-4 30-32 4-6
S 4-6 34-35.5 28.5-30 6-8 34-36 8-10
S/L 2-4 35-36 28-29 4-6 32-34 6-8
M 6-8 36-37.5 30.5-32 8-10 36-38 10-12
L 8-10 38-39.5 32.5-34 10-12 38-40 12-14
V 12-14 38-39.5 33-34.5 14-16 42-44 16-18
VV 14-16 40-41.5 35-36.5 16-18 44-46 18-20
VVV 16-18 42-43.5 37-38.5 18-20 46-48 20-22
Monday Size US Dress Size Waist Hip UK EU AU
PP 00 22-23.5 34-35.5 00-0 26-28 0-2
P 0-2 24-25.5 34-35.5 2-4 30-32 4-6
S 4-6 26-27.5 36-37.5 6-8 34-36 8-10
S/L 2-4 26-27.5 36-37.5 4-6 32-34 6-8
M 6-8 28-29.5 38-39.5 8-10 36-38 10-12
L 8-10 30-31.5 40-41.5 10-12 38-40 12-14
V 12-14 33-34.6 44-45.5 14-16 42-44 16-18
VV 14-16 35-36.5 46-47.5 16-18 44-46 18-20
VVV 16-18 37-38.6 48-49.5 18-20 46-48 20-22

If you have any questions about the exact right size or style for you, please reach out to customerservice@mondayswimwear.com who will assist you in finding the perfect fit.

How to Measure

Step 1

Use a Mirror
Stand in front of a mirror to ensure your measuring tape stays level and parallel to the floor as it wraps around your body. A tape that angles up or down can result in inaccurate measurements.

Step 2

Wear Lightweight Clothing
For the most accurate results, measure against your body without bulky clothing. If you prefer more coverage, wear an unpadded T-shirt bra or a lightweight, body-skimming top, such as a triangle bikini top.

Step 3

Avoid Compression
Avoid measuring over sports bras, shapewear, or other compressive clothing. These can flatten or compress your bust, waist, and hips, leading to inaccurate measurements.

Step 4

Calculate Your Cup Size
To estimate your cup size, subtract your underbust measurement from your chest measurement. The difference corresponds approximately to your cup size:

1” difference = A cup
2” difference = B cup
3” difference = C cup
4” difference = D cup
5” difference = DD/E cup
6” difference = DDD/F cup
7” difference = G cup
Example: Chest: 34” − Underbust: 28¾” = 5¼” difference, approximately a DD/E cup. Use your underbust measurement to determine your band size.

Step 5

No Measuring Tape? No Problem.
If you don't have a flexible measuring tape, use a piece of non-stretch string. Wrap it around the area you're measuring, mark where the ends meet, and lay the string flat alongside a ruler or measuring tape to find your measurement.

Step 6

Measure Your Torso
Start the measuring tape at the highest point of your shoulder, near the base of your neck, and run it down your back, through your legs, and up over the fullest part of your bust to create a loop. Keep the tape flush against your body, ensuring it’s snug but not too tight or too loose around your crotch and seat.