How to find the size guide for the item you are looking at
Short answer: Each brand has its own chart, because sizes are not the same across brands. Find the chart for the brand before you choose a size.
The chart belongs to the brand
A size M does not mean the same thing at two brands. See why the same size does not fit across brands.
Find the chart of the brand
The charts are gathered by brand, for example size guide JBS of Denmark men.
For women
See for example size guide Bamboo Basics women.
Measure yourself once
Bust, waist and hip do not change from week to week. Write the numbers down. See the measuring guide.
If in doubt
Choose by how the clothes are meant to sit. See between two sizes.
If it does not fit
Then you can exchange for a different size. See returns and exchanges.
See also
The general guidance is in the size guide.
If the chart does not fit you
If your measurements fall between two sizes in the chart, choose by how the clothes are meant to sit rather than rounding up or down out of habit. See bamboo underwear for women.
Frequently asked questions
Why does each brand have its own chart?
Because sizes are not standardised. Each brand sets its own measurements.
Which measurements do I need?
Bust, waist and hip cover most of it.
What if the size does not fit?
You can exchange for a different size through the returns portal.