Choose a wrinkle-resistant suit bag or garment bag
Empty all pockets
Button the jacket
Turn the jacket inside out halfway by folding one shoulder into the other
Fold the jacket in half lengthwise
Place tissue paper between folds to reduce creasing
Lay the jacket flat in the suitcase
Fold trousers along the crease
Place tissue paper between the trouser legs if needed
Fold trousers once or twice depending on suitcase size
Put the trousers on top of or beside the jacket
Place heavier items around the suit, not on top of it
Keep the suit near the top of the suitcase
Use a dry-cleaning bag or packing cube to reduce friction
Unpack the suit as soon as you arrive
Hang it immediately to release wrinkles