Oh, Amanda, I have done the SAME THING! You can scare yourself silly over it!!
I have used those same envelopes from LCI paper & you're right. - They have just a *little* bit of tooth to them. But, they take ink so smoothly! I have ordered some letterpress paper & matching envelopes from LCI and I plan to try to design some 50th wedding anniversary invitations for a friend's parents. I'm knee-deep in alligators right now, with "real life" work and a big wedding job. I need more "play" time!!
The other thing that I do to scare myself silly when I start a wedding project is that I almost always panic when I pick up the first "outer" envelope. It's unlined and for some dumb reason I expect it to be lined!! I have to take a breath, calm down, & remind myself that outer envelopes are never lined, just the inner ones are!! I'm not sure what my problem is with that, but I do it almost every time! Maybe with a few more years of experience, I will be able to keep that straight in my head!!
Good luck on your invitations! Please post photos!! If you need any help or advice or hit a snag, send me a personal message!
Janis