handlebar under-tape (extra layer)? I'm going to be re-taping my bars for the first time soon, and I was thinking about a putting an extra layer of tape for just slightly increased diameter and padding. I have big hands, but I don't want the padding kits that are available, as I think that might be too much.

Is this under-taping at all common? I was thinking about using cloth medical-style tape. Would this be a good choice?

(I don't race, just exercise/commute/day-trip, will be getting compact drop-bars)
Double taping or double wrapping is definitely common, and as with all things bicycle there are various opinions on the best way to do it.

I do it mostly for comfort, although as with many others I do have hands big enough to comfortably hold the bars when they're bulked up like that (I'm using two layers of foam tape rather than an under-layer of cotton tape).

I'm not sure there's much advantage to using a layer of non-padded tape, but if it works for you go for it. It's easy enough to remove, so at worst you've lost whatever you paid for the tape.

What I usually do is buy bargain-bin tape for the bottom layer because no-one sees it, and I'll often wrap top-down because I think that works better. I don't tuck the first set of tape into the bar at the bottom, only the outer layer starts tucked in. And I'll often run the outer layer a turn further up towards the stem so it's anchored onto the bar rather than just the first layer of tape. I get that extra tape by only wrapping round the brake levers as little as possible (ie, I don't do the extra figure-8 around the levers), partly because the extra padding often spoils the feel of the levers.