Meaningful to you. not to most folks.
After all that you’re fine with “eh it’s just translation.” then why not try a system that has some meaning to it at all instead of arbitrary numbers. At least that’s what literally everyone else is saying to you in the comment section.
And hey you can decide 20-25 is not T-shirt weather for yourself and 25-30 is. Crazy right?
Okay we can all go home. Fal says “C is MUCH better.” Argument over