Most modern bikes just don’t bother. The racing crowd uses tights, commuters use leg clips or velcro straps, and riding in the summer means wearing shorts, so the issue is moot. And then there is the whole matter of dealing with a front derailleur.
But there are many times when I just want to jump on the bike without changing my clothes, without looking for the rubber band that I used last time, and without worrying about catching my cuff on the chainring. So I’m looking around at what is available in the world of chainguards.
Right now, there are two on my list: This one from Soma
and this one from SKS at Velo Orange:
The SKS model is about $10 less; both are available via mail order. It looks like the SKS will require pulling the crank, and there are concerns about it interfering with the large ring. I can’t find anything reviewing the Soma.