[PerryC]

Cisko,
That's a hard thing to answer because some folks get colder than others do everything else being the same. If you want to buy the least possible, you may think about getting some board shorts or long nylon pants that protect your legs from the sun, then maybe some waders you could wear when it's colder. You may also think about some NRS Rodeo Pants which are neoprene wetsuit bottoms that come to the waist. That way you can layer your torso and remove some clothing as it heats up. Just a thought,
Perry