I am looking for a selection of bright colored, lightweight, golf pants. I'm not a flat belly, looking for 38 x 32, so may be somewhat limited, if even available. I doubt J Lindberg or Poulter would really fit my body very well.

Any help will be appreciated.

Check out www.fairwaystyles.com

I'm sure Ping do some bright coloured keggs. Try Q'aja aswell, even though they are a tad on the expensive side.

I see them in golfsmith catelog all the time. Check their website -the company is called loud mouth golf - -hope that helps, I'd have some but my waist is 30 or 31 and the smallest they come in is 32 and those look too big on me

Subseventy

http://www.subseventy.com/

vineyard vines

Loud Mouth Golf

you shouldn't have too hard a time finding these. Try the preppy brands ie lacoste, polo, vineyard vines, and brooks brothers. Also larger stores like Jcrew, Gap and old navy usually carry bright colored trousers.
If you have unlimited funds I highly recommend Inco chino's made by Incotex. They are carried in stores like Saks and Neimans and usually in spring/summer they have an assortment of pastels and bright colors.

Regarding the poulter stuff, I have friends that are easily a 38" waist and the clothing still fits nicely. My buddy just bought the classic solid colour pants in pink and blue and they fit a bit looser than you'd first think when talking about poulter. The plaid pants were a little bit tighter in the legs (I have large legs) but still fit great in the larger sizes. - I tried some JL and i find some of the poulter stuff (not all) to be a bit more accommodating in terms of fit, and not look out of place at the same time.

Dunning Golf