I had a chest pack and it sucked a lot more than a vest, for me any way.
I've never had one of those willy-gizmos you hang tippet spools on. Never wanted one. I fish with a Cabela's Three Forks vest and it has two small pockets on either side of the bottom larger pockets.
I put one spool each of 3X thru 6X in each of these pockets and I've never lost a spool of tippet out of the pockets this way. Then I keep an extra spool of 5X and 6X (what I use most out here, if i were back in PA, it would be 4X and 5X) elsewhere in the vest just for belt and suspenders reasons.
I do lose quite a few of the elastic retaining bands off the tippet spools though. Good riddance for the most part. I've never like them and think the guy who invented the system probably had a glue habit. I think the best way is the old slot in the spool system that the Orvis SS used to have.
Here's what I use to replace the bands when necessary, although I don't often find it necessary. My spools pretty much stay spooled. If anything, I have more trouble finding the tag on lighter material than i do with unspooling. Anyhow, I'm up to my ears (no pun intended) in these little orange adhesive pulls tabs that are on the back of zinc air hearing aid batteries. Supposedly, the battery isn't activated until you remove the tab. I dunno if that's true, but they make darn fine tippet retainers when pasted to the back edge of the spool with the tag underneath them.
http://www.energizer.com/SiteCollectionImages/products/hearing_aid/faqs/color_codes_and_sizes_chart.jpg
Make friends with somebody who used size 675 batteries in their aids. These are the biggest and best pull tabs.