I'm clueless with a lot of the wedding stuff but definitely with invitations. My FH and I ordered our invitations, they came in the mail on Monday and look great! I've just come to learn that most invitations do a inner and outer envelope. I only ordered a main envelope(outer) and an rsvp envelope. I looked through some things online and it doesn't seem like a big deal at all.. just was wondering some people's thoughts... I don't think my cousin did double envelopes now that I think about it, but I didn't even notice or think of it until now which makes me think, I don't really think it matters.