^ those are cool farmers!.
The ranchers/cowboys/peasants/etc I've seen (not that far from where I live) seem very conscious of how others will perceive their clothing so maybe they dress with functionality in mind, or what their budget allows (used clothes, clothes passed on to them, or new clothes every two years) but I would argue there is compliance with the atmosphere and people they will work with at the time of the acquisition, and always tradition (to respect it or honor it or celebrate it), and it's the third world, it's not like they're oblivious to what their life pends from. Their dress-to-impress motives couldn't be more obvious at fairs by the end of summer, proving that how people communicate with clothes regularly isn't always a response to their 'function' assigned in a social structure..
I hope I'm not taking things out of context but I don't think occupation drastically modifies how we interact with others as long as traditions/culture/habits are shared and people feel the need to express some individuality.. or reproduction potential
.. I actually think that every occupation or activity in society eventually pushes its own sartorial vocabulary, either by minimizing it on purpose or making it seem like it's all about it when it isn't (office environment for example).
As much as fashion/clothing in general is usually kept in the box of frivolity only people with no much better to do bother to open, I find it a complex subject.. obviously (in case I misunderstood something or just totally rambled here!).