Well hello stripes!!! There is a stripe-y piece here for everyone!
More of Martha's preppy look here.
Recreate their look (kind of):
Striped shirt: Toteme Capri striped shirt, J.Crew striped Ludlow shirt, Tomorrowland Georgette classic blouse, or Rag & Bone Boyfriend shirt
Striped pants - Ace & Jig Westside pants, J.Crew Striped cotton pants, Rag & Bone Striped track pants, 3.1 Phillip Lim striped paperbag trousers, or Nicholas Dual stripe wide leg pants