Whatever you're comfortable in! Keep in mind this is a backyard ceremony and brewery wedding party so semi-casual is fine. It will probably be hot so no need for long dress shirts or suit jackets, etc. And for the ladies, ceremony will be on grass so opt for sandals, flats, or wedges.
Take a peak at the travel page of this website for some recommendations.
Yes, kids of family and friends are invited and permitted at the brewery. However, if you can make arrangements for kid-sitting, we'd love to see you let loose and have fun!