We were originally not planning to have ushers, but then realized it would be better given that we'll have pretty close quarters in the ceremony space, so ushers would help us avoid having empty chairs in the middle of rows, etc. We're expecting around 90 guests and the max seating is 100. I would hate for couples be split up due to single seats being left vacant. So, we asked two of FI's nephews to be ushers and they are happy to do it. FBIL said he would be happy to rent tuxes for them or whatever (we're doing suits, not tuxes), but I don't think it is necessary for them to have full suits at all. However, I would like for them to be in slacks and a dress shirt at least. FI said he doesn't want their parents to have to spend anything on their attire and said they both probably have some nice jeans and polo shirts, so they could just wear those. I really don't like that idea at all, but they're his family so I probably need to defer to him on this. Would it seem tacky for them to be in jeans and polos when the groom and groomsmen (our two boys) are in suits? Should I even care at this point?