Engagement picture outfits??

So I got a free 30 minute engagement session this saturday from an up and coming photographer I met on Facebook. She needs them for her portfolio and I'm not one to turn down a photoshoot. My photographer is really booked right now so I'm not sure when she will be able to do mine.

My wedding is very rustic country backwoods barn type theme. I eventually wanna do the typical country engagement photos with the guns and camo and deer antlers but I think I will do that with my photographer.

She said there will be a fall setup. So I was thinking maybe matching flannel? We are both definitely going to wear cowboy boots I'm sure. FH will probably be in a flannel button down and jeans. Should I match or do a nice sweater? I'm leaning towards matching flannel. And should I wear black leggings or skinny jeans/jeggings?

Help!