As part of the over 50 crowd there was a time when I would have been absolutely mortified to go to the office without hose on! Even showing bare ankles when wearing pants was tabu. But I think the times are changing and if the skirt is a proper fit, ie: not a mini skirt showing your behind, that it's ok. This week, for the first time in my professional life, I wore a skirt without hose to work. A cute pencil skirt that comes to my knee. It freaked me out a little, but I survived the day and was a lot cooler. My company has our A/C set at 79 degrees to save money/energy. I am roasting away in my menopausal misery, so the skirt gave me some relief.

I also think you have to be careful not to go too far at the office -- no flip flops , see-through fabrics, belly tops, etc.

I agree totally that an interview is different. You need every advantage you can get and professional dress is a big one.