Weddingbee boards

It also depends on the type of satin (polyester or silk) and the weight. I think in general, thinner and silk satins wrinkle more easily/quickly.

Ask any seamstress or fabric store or high end cleaners, also if you have a scrap you can burn it to see if it is natural or not,  (synthetics will melt rather than burn like paper)  BUT I looked at the Adelaide Dress on Maggie Sottero, it is a poly blend but do not be fooled IT WILL WRINKLE and no you are not crazy for worrying about this.  It is going to be a problem if you ride in this dress.  IF YOU MUST you could ride (standing) in a van, Another option (not ideal) would be to sit on a firm velvet pillow and dont lean back.  I think you really really really need to change there--even if it is the bathroom.  Just get 99% ready, everything BUT your dress (you could wear your bustier, bra, stockings, slip, veil--whatever and ANYTHING over it, then slip into a bathroom and have someone zip you up.  If there is no bathroom ask for any single solitary corner or office or choir balcony or anything-hey I would rather stand behind the building and slip into it if I had to than start with a wrinkled dress.  Its not going to be easy but you might have a laugh and really, its only going to take you a minute!  And you will look great.  One little known secret...if you saw the pictures of Jackie Kennedy arriving in the car with her step-dad?  She had 2 dresses, and each was pressed and swapped 3 times that day!

Personally I just can't imagine going through the crazy hassle of all of the above (ride standing in a van?)  A synthetic fabric will wrinkle less then a natural one. and even if you carry it with you to your site and get dressed in a bathroom there or something (eww) your dress is going to have to be in a bag...in your car on the way there where the fabric will either bunch up at the bottom and wrinkle or the dress will have to be bustled and the fabric will wrinkle from being bustled.  There is no way to not have it a little bit wrinkled. 

But here is the secret of your wedding day...YOU WILL NOT CARE! You are going to be so wrapped up and into whats going on and happy that those small things will not bother you.  And absolutely no body else will notice or care. I wouldn't spend even a second stressing about this.  I rode with my SIL to her wedding for almost half an hour in her vera wang...she tucked it under her in the limo....sat back in her seat...and it was perfect.  

I could not more vehemently disagree with the writer above she (the original Bee who posed the question) does care, she will care, I would care and she will look like a wrinkled mess.  Here is my suggestion when you get your dress, put it on, have someone drive you for the requisite time then get out, if you are happy with the condition of the dress then great, if not, (I know I would not be) and I know other people would be very critical of it, then I would go through any conceivable machination to make sure that my dress STARTED OUT wrinkle free.  I have a lifetime of wearing ball gowns and dresses to all sorts of occasions and I know how to carry, pack, press and sit in every single fabric, some things cannot be overcome. ITS YOUR WEDDING DAY, when else would you care so very much???