Check out the custom telescope covers that Devtron Scopecoat has made for some Astronomy enthusiasts.

Scopecaot - Custom Telescope Covers
http://www.scopecoat.com/telescope_covers.html

Devtron Scopecoat generally makes covers for gun scopes, sighting systems, spotting scopes, and various other optical and electronic devices, but recently has made custom covers for special applications like telescopes and astronomy.