Anyone know where to buy white hair nets?

You mean like this?:
http://www.criticaltool.com/hair-nets-polyester-white-dphn-18.html

No. They’re much smaller. They’re what women used to use to put their hair in a bun. Like this: http://shop.tothepointe.com/images/hair%20net.jpg only white.

the link didn’t work.
So more like a ‘bun cap’ then?

I can’t find a picture of a bun cap, but probably.

How about this one then-
http://coverthatbun.com/Gray-Hair-Net-Crocheted-Hair-Bun/M/B00162BJ5G.htm

I still see them at the “Dime Store” that we have in nearby small town.
If you don’t have one of those left in your area, you will probably have to order them.
Like this?

http://www.cachebeauty.com/Nets/jac-o-net_bobsize_white.htm

@gemiwing no that’s not it. That’s a bit garish. It’s very finely woven.

@wilma That’s it! Thanks!

If you have a Sally’s Beauty near you or some other beauty/wig supply store they will probably carry them.

@elocin the only one near by is Sally’s Beauty and they don’t carry them. My hairdresser has been unable to find them too.