Waterproof cover....I need one, any pointers?

[silverback mike]

Hi chaps. Sadly my garage is going and I need to keep the chim outside. As a consequence I need a decent breathe able waterproof cover for about 8 months or so until I move. Has anyone any experience of a good one. My only (bad) experience was with my s3c when I left it on, got damp inside and lifted the dash leather help please boys!!!!
Mike