My mom asked for my help in looking for online dresses that can be custom-sized to her. I'm a plus-size bride, but my mom is not plus-sized at all so I have no idea where to look for her. She found some dresses on lightinthebox.com, but I heard some not so good things about that place

She's looking for something in lavender, long (she doesn't like legs showing), and possibly capped sleeves? If anyone could give some suggestions of certain websites she could look at I would greatly appreciate it

Thanks!