I'm not sure about 'proper', but I know what my wife likes. She's not one to wear the ubiquitous highland-games garb and costume looking clothing that some wear. She has above-the knee kilted skirts, simple tartan skirts of various lengths and some longer kilted skirts. I think she looks amazing in them! Sometimes she'll just wear a tartan scarf with a sweater--again--completely dreamy With having different lengths, she's able to make her outfits stretch from very casual and fun to more formal. Most of the time however, it's her simple kilted skirts that she'll wear out and about (no mini-kilts! We're much to modest for that).