bellyband

So I am thinking about getting a bellyband any concerns

Order it one size smaller than you think you need.
Don't plan on packing a full size gun, it won't support the weight in my experience but mine doesn't fit tight. I have no trouble with a Airweight J or a P11 but a G19 is to heavy.
Loose untucked shirt or sweats allows for pretty fast access and draw and very good concealability.
All in all I like the Tee shirt and the belly band and will get one size smaller when I order another shirt.

Ages ago when I started carrying I started out packing with a belly band. They're great for deep concealment but after carrying daily with it for a few months I developed a case of IBS that went away when I switched to a leather IWB.