I feel like a broken record, but this situation/problem/I don't know what to call it won't go away.
I've had an awful time trying to get my sisters together to shop for bridesmaid dresses. The few times I was actually able to make appointments, they cancelled. This had been going on since September. On Monday I was supposed to go shopping with one of my sisters, and she cancelled. So I went by myself, found something I thought would look nice on them and that I could be happy with. 
Friday night she sent me a text saying that she could go shopping with me Saturday. I told her I already had plans for the whole day, and that I had picked a dress. She was pissed and immediately called my other sister. 
Anyway, they went to the shop yesterday to get measured and order the dresses, sending me these nasty text all day like "It would have been nice if you asked us before you chose the dress" and "I didn't know we had to pay half today, I'll order it when I have money". Ok, I never told them they had to go to order them yesterday, and actually last Saturday I told them they could just go pick something in navy that they liked and we would be done with it. 
No matter what I do, this is just getting worse and worse. I haven't asked them to do anything else, but I feel like this was unavoidable. I don't expect them to come with me for anything else, and now I am starting to reconsider having them get ready with me because I'm afraid they will find something else to be stressed and b!itchy about. I just don't know what to do :-/