Our sizing is based on a simple scale of XS-XL. Below is a conversion chart to determine your usual comparable size.
If you're unsure, we suggest you take your measurements to determine your best fit. For accuracy, have someone else measure you. Ensure the measuring tape is straight (parallel to the floor) and snug, but not tight, to your body.
For tops, take chest and arm measurements.
For bottoms, take waist and hip measurements.
Measurements should be taken as follows:
Chest: Measure around the fullest part of your chest. This is usually across your nipple line and straight across your shoulder blades. 
Waist: Measure around your natural waistline - this is usually the narrowest point on your waist
Hips: Measure around the fullest part of your low hip - this is usually  below your natural waistline (the tape should run across the middle of your buttocks)
Please note, our garments are designed to have a relaxed fit on the body. Most of our pajamas have an “oversized” fit for comfort and to achieve our desired aesthetic. If you prefer a more slim fit, we suggest you size down from your normal size.
All measurements below were taken by laying the garments flat and measuring the indicated area. To compare your sizing to the measurements below, multiply all top & bottom measurements by 2.
 
Size Conversion Chart 
Size 
XS
XL 
AU 
2-4
6-8
8-10
12-14
14-16
UK 
2-4
6-8
8-10
12-14
14-16
US 
00-0
2-4
4-6
6-10
12-14
EU
30-32
34-36
36-38
40-42
44-46

 
Top Measurement Chart
XS
XL 
Chest 
IN 21 CM 53
IN 22 CM 56
IN 23 CM 58.5
IN 24 CM 60
IN 25 CM 63.5
Arms 
IN 22.5 CM 57
IN 23.5 CM 60 
IN 24.5 CM 62.5 
IN 24.5 CM 62.5 
IN 25 CM 63.5
 
Bottom Measurement Chart
XS
XL 
Waist 
IN 12 CM 30.5
IN 13 CM 33
IN 14 CM 35.5 
IN 15 CM 38
IN 16 CM 40 
Hips 
IN 16 CM 40.5
IN 17 CM 43 
IN 18 CM 46 
IN 18 CM 46 
IN 19 CM 48