This is remarkably thought-provoking. Most of the time I do dress to be seen. (Except when sewing mockups or something and I spend the afternoon in stays!) But I am totally alone in my home, and pretty much no one ever comes to the door.
Yesterday after church, I spent a long afternoon and evening of sewing on the family room floor. It was borderline warm with a strong cool wind. I opened the windows, but wore leggings and (matching) t-shirt and socks, with a (matching) cardigan when I got extra chilly. It was definitely not an outfit to step outside in, except in the backyard. And perfect for sitting cross-legged on the floor for hours.
But it's rare that I have a whole day without going anywhere, so to some degree, I dress to be seen. Even in summer, when it's a t-shirt and athletic skort, I coordinate small jewelry and footwear and wear makeup.
I may be unconventional on what constitutes "casual" and "smart" clothing. Saturday I had shopping and errands, so I wore a navy Buzz Lightyear t-shirt, chambray skirt, black belt, and black/blue sneakers. After errands, I ended up at my brother's house, helping him lay out a flagstone patio and build a retaining wall. It was all perfectly functional and comfortable. Buzz got a bit dusty, but nothing that a wash won't fix. I don't make a habit of wearing nice clothes for heavy labor, but skirts don't equal dressed up to me.