It has nothing to do with who was watching when. The notion of performing duties in a skirt is ridiculous. Ask anybody who has to do any form of manual labor (like realigning sensors, crawling in a Jeffries Tube, or performing calisthenics) in the real world and they'll tell you that a skirt is hardly the easiest thing to work in. It's like working in high heels or in combat boots if you're a sever at a restaurant. It's just impractical and doesn't take any advanced form of knowledge to figure that out.