It isn't appropriate as a software developer to wear a suit to work. It often isn't even appropriate in an interview as a software developer to wear a suit. It looks ridiculous to wear a suit jacket when the next few layers of your management chain are wearing board shorts and sandals.

Instead, the ideal seems to be to tread a fine line between casual wear and formal wear. Properly fitted clothing is important here- a suit is too formal, loose jeans a bit sloppy, but dark jeans that are tailored to fit are perfect.

This makes shopping in the women's section very difficult- I usually find casual-wear for women a bit inappropriate for work (clothing is often too sheer and unlined, too clingy, or necklines too low), and clothing marketed as office-wear would make most assume I was a secretary or in advertising/human resources/ect. A mixture seems to work well. Rather than dressing up casual clothing, I find more success dressing down nicer pieces. For example, a nice dress with a denim jacket or a silk blouse with jeans and flats.

My male friends seem to have a similar problem shopping, in which clothes that are made for casual wear are more casual than they would like, but then there is a huge gap from casual to much too formal. Men's clothing doesn't have the problem of many causal clothes being too revealing, but there is also quite a bit less variety available.

TLDR: Ramble about trying to find appropriate software developer wardrobe that has nothing to do with the above comment. Sorry.