What does a pastor wear?

The rabbi who's marrying us (also not a religious ceremony) asked us what he wanted us to wear. A suit, a tux, his rabbi clothes (sorry I have no clue what they're called lol). We told him to wear whatever he's comfortable in.
I'd suggest that you remind your pastor that it will most likely be a hot day and you'd love it if he could wear something breathable to make sure he won't pass out during your ceremony! Lol

I would have thought that suit pants, a shirt and tie would be fine (and not too hot). He doesn't need to co-ordinate with the bridal party.

I don't think there's anything wrong with speaking with him about it! Just something like "Hi xxx, I know a lot of times you wear a suit to officiate weddings. We just wanted to let you know that our wedding is a bit more casual so if you want to go without a jacket/tie/whatever that would be totally great with us. We know it will likely be a hot day, so we want to make sure everyone is comfortable!" Something nice and not necessarily telling him what to wear, but letting him know a full suit isn't necessary.

To answer your second question: I've ever seen a pastor coordinate - they typically just wear whatever as long as it is the appropriate amount of "formalness" for the wedding

I would not tell him what to wear, I’m sure he has appropriate outfits for when he officiates outside. They definitely don’t coordinate colors or styles with the bridal party.

You could mention that he can wear whatever he’d like, but that he shouldn’t feel pressured into having to wear a super fancy 3 piece suit to the wedding. He doesn’t have to coordinate color wise. My pastor just asked me if he could forgo a tie since it’s gonna be hotttttt on my wedding day. Even though it is a fancier ceremony, Im no going to tell the poor man he has to wear a tie since he is a sweater and because he is spending all the time counseling us, etc. so he can do what he wants.

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I second this approach

I am so glad you asked this, because I haven't. Thank goodness we haven't met with minister, but may ask him. Ours is casual also. Thanks!