Why not use an ith design, then you can choose any colours you like.

You can choose any color fabric or thread with this design. And you can choose any design that fits this cute apron. Have fun and hope you find what you like.

take a bottle and a tape measure. use an A4 size piece of paper to get an idea of width and length Add turnings and hems as needed and then simply make your own template for the basic apron shape. Its an oblong with the top two corners nipped off and a neck strap and waist ties added. this will give you the chance to make a lot out of a piece of white cotton sheeting
this way you can make them to fit anysize bottle and any length too.
finally spray starch and embroider as you wish.

If you need blanks -- why not use the white and some good fabric dye to make black?
You might also ask embroidethis to carry other colors.

I would use one of the In the hoop designs if it were me - as it seems the most cost effective way to make them any color.

I did find one (edited so now two) place that has more than white blanks at the link.

Hatched in Africa has free download for in the hoop wine bottle apron . You need to log in. Go to free stuff click on more info with the design and then click download detached. I hope this is clear

Get creative and make your own. use craft ribbon for ties and make your own pattern. Embroidery something simple and you are finished. $6 + is too much!!! Kay