There are several other types of shoes that can be worn with a black pantsuit besides heels and flats. Here are some options:

1. Loafers: A pair of sleek, polished loafers can add a touch of sophistication to your black pantsuit ensemble. Look for loafers in black leather or suede for a classic, understated look.
2. Ankle boots: A pair of ankle boots can give your black pantsuit a bit of edge and modern flair. Opt for a sleek, pointed-toe style in black leather or suede.
3. Sneakers: For a more casual, comfortable look, you can wear a pair of sneakers with your black pantsuit. Look for minimalist, clean-lined sneakers in black or white.