I have two montane velo featherlites. The bags they come in are completely the wrong shape for a jersey pocket but a fabric sunglasses case makes them longer and thinner.
They are really good jackets, I’ve had one for nearly 10 years and it is still going strong. Good for light drizzle. You will eventually get damp but it’ll keep the wind off and keep you warm.
The high vis ones (like most high vis items) fade over time. Also while the cut is ok it is definitely not an aerofit. 99% of the time it isn’t an issue but I would never use one road racing.
There are numerous stretchy jackets out there. I have a lusso clear one that is a very good fit for racing. Boil in the bag though, so it either need to be cold or wet enough that a bit of condensation isn’t the worst outcome.
These days there are lots out there. Sportful kit looks nice, dhb have some of their own and all the big names produce jackets of this type.