Swimming

Swimrun wetsuit

This I reckon. Then you can run to pool in it and back with less kit.

They also usually come with additional sleeves, and you can get neoprene calf guards too for when it's colder.

I love my SwimRun wetsuit so much I got rid of my full length one. I've used it in lidos, the sea and rivers. They're also easier to get on and off, and have pockets etc for keys and whatnot.

If you really want a full length wetsuit, the Orca Open water is a good recommendation for cold swimming, good price and well made.