Honestly, I’d start with a lightweight, water‑repellent nylon‑spandex blend—so it keeps that crisp silhouette but still moves with you. Then layer a thin, breathable mesh under the shell for ventilation. For the pockets, use hidden zippers on the inside panels and make the seams a bit sculpted to keep the shape sharp. Quick‑release fasteners would sit on the cuffs and shoulders, so you can unzip fast when the weather turns. That way you stay runway‑ready but ready for the trail.