Because I am still a child, I get my undies at Walmart, since I can get Mickey Mouse, Muppets, etc in adult sizes.
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I do have basic black, white and 'nude'... and some ahem.. 'fundies' but just like socks, I figure if you have to wear them, you may as well have fun with them.
While we are on the subject... Why, when people ask me if I want a choccie bikkie, say leccy, brolly, etc all cutesy, is it 'childish' to say panties? I haven't figured that one out, but I was corrected when I first came over, and asked where to find them in a shop. I was informed adult women didn't call them that unless speaking of a child's underpants.
Another thing I brought over after my first six months was my Pampered Chef measuring cup with measurements in cups, ounces and ml.