The etiquette of pants?

I would be interested to know more about etiquette, especially from men's own perspective. I can imagine quite a lot of men don't like pants, politically, perhaps. Is it comparable to the freedom of not wearing a bra? I really have no idea. Does it boil down to what trousers one wears?
Are there special rules for builders in tight track suits? I guess builders are sensitve to national awareness of 'builders' bum' so might make extra efforts. But what of pantless builders? Are they just 'liberated'?
Men's experiences shared here are very appreciated - is it prudish mind the visuals?
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The inside of jeans has to be a bit rougher than the inside of a t-shirt. But what would I know?
Do you mean underwear?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Bras are different though, they are one of the most uncomfortable things in the world (at least for someone small-breasted who doesn't need the support).