Is it ok if my boyfriend helps me pick out my wedding dress?

My boyfriend knows me better than anyone else I know. He said he wanted to help me pick out my wedding dress when the time comes, and I think that’s fine. But I’m getting negative responses from people I know about this. I have no one else to really bring to help me pick out a dress.
Is it ok to break tradition? Is it so bad for my boyfriend to see me in the dress before the wedding day?