Wear the actual clothing underneath
Try the rain layer over the jacket or other clothing you intend to wear. Close it and move your arms and shoulders as you would when reaching a handrail or carrying a bag. A layer comfortable over a thin shirt may feel tight over several garments. Check whether sleeves and hem sensibly cover the clothing below. The appropriate size cannot be inferred solely from your usual everyday size.
Test access to the bag
Wear your backpack or shoulder bag with the layer and check whether essential compartments still open. Consider how you will retrieve an admission confirmation or phone without putting everything down in the rain. A suitable accessible pocket may help; check its actual properties rather than assuming water protection. Keep important documents appropriately protected as well. The jacket covers your body, not automatically the entire contents of an open work bag.
Balance wearing time and packed size
Short transfers between buildings create different priorities from long outdoor walks. Read the manufacturer's intended-use and care information. A compact layer can be convenient when it otherwise spends the day inside your bag. Practise folding it beforehand. If fitting it into its cover requires considerable effort, it may become an extra loose item to carry after the first shower.
Handle wet clothing separately
Plan an appropriate place for drying or temporary transport after rain. Do not put the wet exterior directly against papers or dry spare clothing. Follow the care guidance and avoid improvised direct heat. Unpack a damp jacket that evening rather than leaving it tightly enclosed until the journey home. A useful rain plan goes beyond leaving the hotel and includes dealing with the layer once the shower has passed.
