I follow a basic outfit formula of bralette, loose tank, shorts or skort!
You do NOT want to be wearing an actual bra on the farm.
These skorts are particularly great! They have built in shorts with a pocket big enough to hold my phone.
I sometimes go with just the bralette, but I pick all my outfits with a shirt included! It's nice to have options and layers.
You need AT LEAST two pairs of shoes. I like to bring three or four! You need to change it up so your shoes are rubbing your feet in different places, and the weight distribution is a little different.