Question on fit of GoLite gear

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Slim fit doesn't mean 'fits skinny people well', it means 'runs small', or as they like to believe 'athletic cut'.
I'm 5'10" with a 42" chest and my Dakota windshirt is size large. It is just a touch too small to wear anything bulkier than a 100wt fleece under it. I can technically get an 850 fill MontBell UL inner under it, but I look rather 'sausage-y'.

I don't own any of their insulation pieces but when I bought my Jam, the salesman was trying *really* hard to get me interested in the Demaree. It looked nice enough, probably much the same quality as you'd see in anywhere else.

I'm wearing a Wildwood Run Top right now, which Golite describes as fitted. Mine is a size medium, and I'm typically between sizes for most brands, but I sized up for this particular shirt. I probably could have gone either way on size, just depends on how you want it fit. The fit in a medium is similar to my patagonia cap 2 t-shirt (also size medium), although the material of the wildwood is much lighter – maybe even a bit lighter than cap 1.

Not very familiar with the sizing of their jackets, so I can't help you much there. I did briefly have a Bitterroot down jacket, but quickly returned it because the hood was huge and had no adjustments.