Should i be mad?

Nothing that you need to be concerned about. Adults will dress themselves. If FIL comes in something a little off from everyone else, he'll be the one that looks funny. Don't concern yourself with what other people will be wearing, it's totally not worth the energy to make it into a thing or try to "handle" it.

You can suggest a tux to your fiance's step dad, but tell him its ultimately up to him what he wears.

I get that his objection is annoying, but it’s not going to really make a difference in your day. And it’s definitely not worth the aggravation. Fathers of the groom usually don’t have much spotlight in weddings other than for family pictures. So as long as he’s dressed nicely, I’d let this one go. Maybe he’ll change his mind if he finds out step dad is wearing a tux. Or maybe he simply can’t afford one, or has some other reason why he doesn’t want to wear it. But seriously, save the stress for something more worthy of your time.

Usually parents choose their own attire. Neither my dad or FIl wore tuxes. They just wore suits they already owned, and they looked great.

It’s not your place to choose any of the parent’s attire.

I had the same problem. My father-in-law already owned a suit and that's he wanted to wear. I would have liked for him to wear a tux because that's what all of the other guys in our immediate family were wearing, but it was his choice because he was the one paying for his attire. The part that upset me is that my husband didn't want my dad in black because he didn't want him to look like a groomsman, but his dad's suit was black. I was so not happy when I saw his dad's outfit because I fought with my husband because I wanted my dad in black. I had also envisioned my dad's tux black, but he said no. It really upset me that the same rules apparently didn't apply to his dad. I had asked him several times to ask his dad what color his suit was, but he wouldn't. He knew I was angry when I saw his dad and he apologized because he knew at that point he should have asked his dad like I wanted him to. If he had, my dad's tux would have been black like I wanted. The only reason I had a say in what my dad worn is because he told me to just pick it out. He hates shopping and works 12+ hours a day so he really didn't care to go looking at clothes for the wedding as he didn't own a suit or anything already.

I agree with the other PP's. Really only outfits you have a say on is the bridemaids and maid of honor. As long as he is dressed appropriate for the occasion that is all that matters.

Why would he need to wear a tux? Is he a grooms men and it is the required attire for them? Otherwise, what he wears shouldn't be a concern of yours and do you really want to stress about someone else's clothes?

Unless you are paying for it, I don't think you get a say.

Nope, you should definitely not be mad. The good news is that this is one thing you can cross off your list of things to worry about! Picking your battles is an excellent life skill to practice.

Try your best to let it go. Trying to micromanage adults is tiring and almost never ends well!

My dad refused to wear a tux also, his words were “I love you but no one is making me wear a tux”. He walked me down the isle, no tux. He dressed himself nicely and i thought he looked very handsome and didn’t have an issue with it. He’s not a tux guy, he doesn’t like them. Just ask him to dress nicely, show him what the other men are wearing if you want him to match a bit, he will make his decision. Nothing you can really do about it.