I know what you mean about trying on clothes-amazing what china considers x-large compared to us companies.
I buy most of my work clothes from either a co called gemplers or duluth trading. Both on-line but as I'm a repeat customer I know how thier sizing charts work so I rarely have a problem.
I'm lucky to have both a bass pro shop and a cabella close by.
I'm an avid fisherman- being from the midwest I have fished for every thing from bass to catfish to salmon-but never halibut. That most be quite the challange!
What part of the country are you from?