Deninitley ROHAN for me, even though I'm an old man. Trousers to wear are their BAGS, but if you want a blazer get one from ORVIS. (about £195)
The one that I use can be crumpled up in the luggage rack and at the end of a 13 hour flight it will look as smart as when new. I've used their products for years.
Rohan Rohan Bags - 31" Bags - Mens Outdoor Clothing - Rohan
Orvis Men's Travel Blazer Jackets / Traveller's Hopsack Blazer -- Orvis UK