For more years than I can remember, I have bought and worn trousers with a waist measurement of 36". Some months ago, I bought a pair of cords with a 34" waist as I felt I was getting slimmer. Having bought them, I found that wearing them, while possible, was not exactly comfortable. This morning, after my trousers got distinctly damp while cycling back from swimming, I tried them on again. They fit with room to spare and are comfy without any scrunched up waistband round my middle.
It is perhaps time to review the trousers in my wardrobe and look in the shops selling men's clothes to see what else I might like in this size.