I'm looking for a source for a lightweight blaze orange helmet cover for my mtb helmet (no visor).

Some of the big bike houses (Performance, Nashbar) have helmet covers, but apparently not in blaze orange.

There is one out there for equestrian helmets. I called the mfr but, to the extent he understood the question, he said he thought it would not fit a bike helmet.

They exist for ATV and motorcycle helmets, but all the ones I've seen are designed for full-face helmets with chin guards.

Ideas?
Thanks.