I think don;t wear jeans unless everyone else does - a smartish pair of trousers OK to start off with.
I work in an office and jeans are acceptable and seem to be worn more and more including by me. I also wear smarter trousers when I feel like it, or a denim skirt, or wrap dress.
I on;y work part time so I often wear what I want to wear for the rest of the day, e.g. going to the park, not likely to want to be doing that in a suit and stilettos.