I have quite a collection of kecks in my keck drawer. Mostly, M & S. I haven't heard of a lot of these new-fangled companies, eg Sloggi.
I did buy 3 pairs of expensive silver-plated (or something) knickers for quick drying when I went on my Pembrokeshire Coastal Path walk 3 years ago. I hardly ever wear those because of the cost, and I don't need stuff to dry quickly when I am at home.
I may have to go out and buy a lot of new clothes at some point - I'm currently on the weight-loss cusp, I think. I've lost over 3 stone in the past 9 or 10 months and my underwear still fits reasonably well. Apropos fboab's comment re allowing one's "junk" (I think that is a current term I heard somewhere) to swing free, my "briefs" are now sufficiently loose-fitting around the thighs that, after a bike ride, I often have to carefully replace my genitals into their proper place. This can cause hilarity, depending on the company.