My new chaincase came from Hoopdriver Bicycles and made by Velo Orange. Not cheap but good quality.
Us North Americans tend to underestimate the lowly chainguard (and fenders for that matter) on the bicycle. I'm a firm believer in clean pants and figure it can't be all that hard to produce a good chainguard that's going to keep them clean. Instead we've now got plenty of "city bikes" on the market (commendable for sure) that still lack a good chainguard. For example, Linus and Public bikes are two popular city bikes being seen all over Toronto. They've got fenders, racks, upright handlebars and simple, rational gearing. Yet they still lack a proper chainguard. Instead all they do is protect pant legs for just a small part of the turn. If your pants can still get oily or get jammed in the gears why bother at all?
I had previously blogged about my first attempt at clean pants using auto loom to cover the chain. It wasn't a failure though it might require occasional replacement of the loom as you can see how mine cracked (though it still worked), or find more flexible loom.
I wasn't sure how it would stand up in winter so I decided to splurge for the chaincase.