I'm surprised at all the 30-inch waists on guys who are taller and heavier than I am. I'm only 5' 9" tall and I think I look not just trim but even thin, yet my waist has not been under 32" for years and is now around 33". I weigh 165 pounds.
Bodily waist size and trouser waist size should not be confused. I have to get trousers to fit my butt, which often means that the waist will be too loose, since a lot of trousers, especially dress ones, are cut for guys with "six o'clock" backsides. I can usually wear casual trousers in a 32, while often I have to get dress trousers in a 34 and have the waist taken in.
laughing that a 34 inch waist is considered big. 36 waist here, 190 5'10
I am 5'10" 170lbs and have a 34" waist so apparently compared to most guys on here I am big! LOL