Try it on. Just don't ask if it fits.
Your waist size is fine. It's everything else that doesn't fit.
The body-scan retreat: why your phone camera never fixed sizing
Where body scanning actually works — and why your wardrobe isn't on the list
The size that isn't your fault
The fit tech already inside your favourite store (you've used it without knowing)
What Is a Men's Medium, Really? Seven UK Brands and a 7cm Question