I have a pair. I use them about the same way that you are thinking about using them, Roger. I have put base layers on underneath them and I use them as my rain gear as well. So, I am able to throw them on right over whatever I am wearing. They work great! I love them!
I'm about 5'10 / 190lbs. : 34 waist / 32 inseam
I wear a large and they are perfect. BUT, I would not go any smaller!!!!! The waist is not the problem for me, nor is the length. Its the thighs. Any smaller would be uncomfortably tight for me. Especially with clothing on underneath.
I do tend to wear clothing that is lose fitting. I do not like to feel restricted by my paddle gear.
You may want to try the XLs. You are (obviously) taller than I. But, you also (IMHO) seem to fall better into the XL scale of their sizing chart.
I would worry that the Large would be just a little too snug for you if you decided to wear them with a base layer or threw them on over some other clothing.
Net/Net: I don't think the XLs will feel to big, especially if you have layers underneath. The large would probably work, as long as you didn't really wear anything underneath. Of course, that sort of restricts your use of them. According to the sizing chart, XL should not be a problem for you at your height.
2nd Net/Net: NRS has an awesome return policy.
If I were you, I'd probably order the XL and see how they fit. Try them commando, with a base layer and with full on clothing. If it feels too baggy, long or whatever, return them for the large.
Good luck and I hope this helps!
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Answered on 12/10/2012
abqhack from New Mexico