I'm going to be the lowest level guy in a room of like 20 people. Top executives at my company and execs from a few other companies.

I don't want to overdress in a suit. No tie. Sport coat, dress shirt, and some sort of pants (not jeans) seems to be the required dress code.

I have a black sport coat that looks ok and a gray checkered one that looks ok. Typically, I wear these with jeans. What should I wear with these?

Can you help me out? I'm also happy to buy a new jacket and start from scratch.