It is the height of summer here, so thinking about winter clothes is not easy, but I know that manufacturers need long lead times.
LTS, please remember to have a selection of winter skirts -- skirts that can be worn outside in cold weather, including in the snow and blowing wind. For example, wool skirts, or skirts that are at least lined against the cold and are subtly weighted at the hem so that they do not blow up easily.
Here in Winnipeg Canada, winter days below -15C are fairly common, and wind chills that the apparent temperature feel about -19C are frequent. Those are _typical_, with the end of December and most of February often having a number of days below -25C. Fortunately for us, those days are usually low humidity: our winters are seldom "clammy". Edmonton's climate is fairly similar, as is Saskatoon's; Ottawa's climate averages warmer but is still prone to cold days. Calgary can be just as cold, but can be quite variable. I understand that the Midwest of the USA is fairly similar (or windier), at least until one gets far enough east to reach the "snow belt".
To those who haven't grown up in Canada, the thought of wearing a skirt in those temperatures might sound crazy, but just the same way that mitts are warmer than gloves, a lined weighted skirt is often warmer than pants.
Also, as odd as it might sound, there is also a market for above-the-knee winter skirts; such skirts are often worn with tights or leggings.