That's what I was driving at. I suspect (but do not know) that value in a remote jungle location will equate to "will not let me down", as replacements are likely to be very hard to come by. Value here means "I don't care when I rip the **** out of it". Different location, different rules.
The reason I suggest 5.11s is I work strides hard. I buy two pairs at a time and have one on, one in the wash. They are double (and in places triple) stitched, reinforced knees and backside with multiple cloth layers. I kneel down weeding, run machinery, paint, roof, tile, cut wood and allsorts in them. They last around three years (alternating two pairs worn every day between them). At which point the cloth wears through (on every pair so far). I have never had a zip or seam fail. Ever. All zips are proper YKK (as an example). Dickies have cheap zips, the pull tags break, the zip fails (had both happen inside three months). Not value if a new zip is a few hundred miles away. Nor though would cheap overalls be (there). Now I wear poly cotton ripstop TDUs - they wont work in a hot climate - but they do make lighter weights. Either way I would buy them now and wear them in to be sure they last - most things fail in the first few months of continual use.