The USMC Marines from Camp Genoa are seen in town in their digital (deployment) uniforms. Marines cannot wear those off base other than being in actual field training or combat. For the bar and town scenes, they would be in some combination of the Alpha or Bravo uniform, the dress green blouse and trousers with the Khaki shirt and tie. Or at more formal events, in their blues.
The Amish in this series are seen wearing buttons on their shirts. The old-order Amish forbid buttons on clothing as they are seen as a sign of vanity and pride. This means that traditional Amish clothing does not use buttons but instead relies on pins or ties for closure. It is unclear if this was intentional or a mistake on the wardrobe departments design.