dd has worn a spibelt 24/7 since the beginning. Day night playing sleeping etc. She takes off the pump in the pool. It's totally comfy and the tubing we tuck in with the pump so no issue at all. Get the regular spibelt, not the D one for pumps. You don't need a button hole and you'd have to detach to take the belt off. The zipper leave plenty of room for the tube so you can just take it out without a problem.
Also, there's these, but we never needed one.
DD age 10, dx at 4 (Oct 2006), Pumping with pink MM since July 2009, added Guardian February 2010. Podding over the summer since July 2012. Dex 4G January 2013. Also peanut allergic and asthmatic.
DS age 13, non-D, but peanut allergic and asthamtic too. Also Asperger's, ADHD, and a pinch of OCD.