My dress already has crinoline in it but Im not adding more.
I don't think you need to add more, I think the designer would have done that if thats they way he/she wanted it ;) I think its compltely up to you. Its all style preference. If you like it, do it. If not, then
don't.
But, you can buy a skirt that gives a fuller dress rather than having your salon sew it in...they may just be trying to get more $$$ out of you.
If you haven't already done it, but still want the crinoline, let me know because I know my mom has a couple skirts and it would be way less expensive (50% off the tag) than having it sewn in. (Plus you could take it off if you wanted,
like dsatwood did.)
HTH! :)