Kamil, I do not recommend Tyvek suits (I think that is what you are talking about) unless it is plenty cool outside. I have spent a lot of time wearing them and never liked it much. They don't breathe, so you end up soaking in sweat in a very short time. I would go the cheap jeans and shirt route if I were you. Or if you really want coveralls, go with some light weight cotton coveralls.

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Keep everything as simple as possible-but no simpler--Albert Einstein