Did people got slim or I got fat

I'm in my end teens , 5.10 and my waist is 42

I bought a shirt in 2023 on my birthday and at that time my waist was 40 ..and that shirt was XXL...it still fits me perfectly

And now I bought another shirt for my birthday and it's 42 and it's 5xl 😭....

How can a XXL in 2023 be similar to 5xl in 2026

I know I'm a bit overweight but not that much that I need to wear a 5xl