Wedding dress dilemma

I’m getting married next summer and I have an appointment at a bridal salon at the end of June to go try on dresses. However, I was looking online last night and found one of my favorite dresses at a salon not near me and it’s super discounted because it is part of their sample sale. I spoke to the women and she said it has no tears or stains and sent me pictures of it. It’s the only one they have and it’s in my exact size.

Because it is so discounted part of me doesn’t want to pass it up. However, since the salon is not in my area and I can’t try it on. I would have to order it without seeing it in person or trying it on. I was thinking of just ordering it, still going to my bridal appointment, and selling it if I didn’t end up liking it or using it. Is this a crazy idea? My mom thinks it’s a great deal too but also is worried since I haven’t tried any on yet. Help!!!