Inviting boss & coworkers

There's no etiquette rule for inviting coworkers and bosses that I have ever heard (other than something that applies to any team/group, like: don't talk about the event in front of people who are not invited; invite all or none of small, tight knit groups; make sure you also have enough room to account for their significant others in your guest list). Who is telling you you are supposed to invite your bosses?

The practical guidance I like, is to only invite people that you are friends with outside of work. The reason for this is because of how easy it is to lose touch with former coworkers once someone switches jobs, unless you have a real friendship in your personal lives. If these aren't people who will be in your life for many years to come, why would you want them at your wedding?

Edited to add: people dropping hints for an invitation is no reason to invite them. But it might mean you are talking about your wedding too much at work.

Hi ! My husband invited only one coworker, but it was his friend before they worked together. I did invite my 5 closest colleagues with spouses, including 2 bosses. For the rest of our coworkers-friends we organised a party at home, one week after the wedding.

Issue has resolved itself, got a new job. If I stay in touch with anyone from this job and feel like I should extend an invite I will, if not then I invite no one.