What to wear on a breezy mild day
A sunny afternoon can feel cool on an exposed bridge or platform. Plan for wind at the places you will stop rather than choosing by temperature alone. A layer that closes and a bottom that stays clear of your shoes can be more useful than a thicker outfit that flaps open.
Start with a simple base and one closure
Try a tee or thin knit with straight trousers and a jacket you can zip or button. A denim jacket can work in light wind; if the wind cuts through it, trade it for a more protective outer layer. Use the photographed jacket-and-tee combination as a color reference, with longer trousers if the day is cooler than the photo suggests.
Check loose pieces before you leave
A roomy shirt is fine beneath a jacket if the sleeves do not bunch. If you prefer a skirt, check how it moves on steps and in gusts; choose a longer, more stable cut or use trousers for an especially exposed route. Tuck a scarf end into your jacket where it will not catch a bag strap. On a bike, keep dangling hems and accessories well away from moving parts.
Rehearse the stop-and-go part
Walk a block in the layer you plan to wear, then stand still for a moment. If it only feels comfortable while moving fast, add a thin layer or swap the jacket. Pack it once to confirm it fits in the bag you actually intend to carry.