Before Milly, NYC, September 2015.
So many great striped shirts — worn untucked — from last September/October. I love the way she has styled hers with wide leg pants and distressed sneakers. More relaxed striped shirts here, here, and here. 
Recreate their look (kind of):
Striped shirt — Equipment Daddy blouse, Toteme Capri striped shirt, Madewell Streetview Tunic shirt,  ASOS Boyfriend shirt with blue stripe, Rag & Bone Striped Boyfriend shirt, J.Crew Perfect shirt, Steve Alan Stand Collar shirt, lan oversized Rag & Bone Virginia striped silk shirt, Steve J & Yoni P Striped cotton shirt, Vetements striped shirt, J.Crew Play Comme Des Garcons stripe button down shirt, or Chloe striped denim shirt 
Wide leg casual pants — J.Crew Cropped wide-leg trouser, Theory Tennen cropped suede wide leg pants, Vince mixed media wide leg pants, ASOS cropped wide leg pants, J.Crew Rayner chino, or Alice + Olivia Scarlet darted wide leg pants
Jumpsuit — A.P.C. Erika denim jumpsuit, Rag & Bone Clare jumpsuit, Glamorous Tall denim boilersuit, Michael Michael Kors Denim jumpsuit, Current/Elliott The Basic jailbird denim jumpsuit, T by Alexander Wang zip-front boilersuit,  J.Crew Edding chambray jumpsuit, or Paul Smith Flight suit