I've got a more normal fit membrane jacket. No excess fabric but plenty of space for layers. Room to breathe? It has pockets with mesh inner pockets. They are very effective vents. These aren't actually pockets but put zips. The pockets are internal and access is through the vents or from inside if the main zip is open.
I've seen vents on more conventional designs including paramo. They do offer decent breathing room. A lot of excessive fabric isn't needed with good design. Imho it's a sign of lazy or poor design.
I've seen vents on more conventional designs including paramo. They do offer decent breathing room. A lot of excessive fabric isn't needed with good design. Imho it's a sign of lazy or poor design.