There's many different ways to do hoses in the inner sleeves, Some people use elastic sewn inside the sleeve with a plastic buckle, some people use mini carabiners and a keyring sewn to the sleeve.
You'll find some inspiration with different examples in these threads
Hey guys, was wondering what some of you have done to attach the hoses up under the double sleeve. I have an Arkady suit and she has sewn some small parachute clips under there and was just mulling around in my head different methods of securing the rubber hoses to the clip. Any thoughts? Suggestions? Or better yet, photos? Thanks anyone and everyone!
Looking at different ways people get them to stay in there. My Arkady suit has clips in them which work out well. I want to wear my MOW suit this week and will need to keep the hoses up in there. The obvious option would be to replicate what is in the Arkady suit but I always like to see what others are doing.
As far as length goes, it's going to depend on your arm length and how far up the attachment point is. You want them long enough so you can bend your arms but short enough so they don't bunch up and flare out the upper sleeves when your arms are straight. If you use an attachment method with some elastic it will help with mobility.