Is anyone aware of the dress requirements at these restaurants? Thank you.

I have been to Gibson's as well as a couple of Morton's in other places, and I would say business casual is fine.

Thanks. The websites for both show men in jackets and ties which is why I was wondering.

I've been to both and business casual is definitely fine. Men don't need to wear jackets. A button down shirt or sweater would do.

I was at Gibsons while in Chicago last June ... hubby wore slacks/polo short, I wore capri pants with nice top ... this was fine. Most people were dressed "smart" or business casual. I don't recall seeing too many suits/ties (if any). By the way, I had one of the best steak dinners ever at Gibsons (their specialty sirloin) ... I highly recommend it. Tables are a bit close together, but the service and food were great.

Id go dress casual, its the best way to go