A useful layer can make the transition between indoor and outdoor settings simpler. Start by considering the temperatures and activity levels you expect.
Leave room for the layers underneath
Compare chest, sleeve and length measurements where they are provided. An outer piece should allow the movement you need without relying on a size label alone.
Plan where the extra layer goes
If you will remove it during the day, consider its packed size and the space available in your bag. Check the product details for weight or packability rather than guessing from photographs.
There is no need to make every piece do everything. Choose a combination that suits your routine and the conditions you expect.