I just upgraded from the Command Armband to the new gag HUD and I have the PLUS Cuffs with arm cuffs plugin. I have problems wearing them all together!

Once you have updated your gag to v3.20 and above, the Signature Command Armband is obsolete. The new gag uses a Command HUD instead of a Command Armband. You will no longer need to wear the Command Armband (indeed you can't - it will interfere with your HUD's operations).

If you have the LULU PLUS Cuffs with arm cuff plugin, you will need to wear the original right arm cuff that came with your arm cuff plugin.

You can trash your Command Armband after you have transferred the stats (especially your Circle stats) over.