schue, welcome to the FJ site. I see you are new here, so let's help you out a bit.
FJ shirts are quite a bit different than the Ashworth models, mostly because of the performance fabric. You should know that Ashworth brand is now owned by Addidas, and it's their higher end products for a more "traditional" look and feel.
The FJ models feature a nice generous cut and the fabric stays nice and crisp from wearing to wearing. The only difference you might find is that FJ has a more limited amount of styles and colors from the other brand you mentioned.
Please go to the home page and look up Outerwear and you can see the different styles and colors available. The staff can help you find a local retailer for you.