This may be an outdated question so please bear with me.

We are on a rather tight budget, so I am trying to save as much money as possible on our invitation suite. Our wedding will be what I think of as semi-formal to formal (Saturday evening, church ceremony, dinner reception), but not black tie. The invites themselves will be in a classic style, with thermographic printing.
Is it okay to skip the inner envelope, or is that tacky? I was also considering a belly band in place of the inner envelope.