Yeah! In your bra, under your arm. I’ve never tried it, and I think the pump would be hard to fish out, but some people do it! 
Eewwww.
Wearing my pump in my bra is one of the spots I use quite a bit. I find it depends on the bra - if it will work. I find if I clip it over with the display facing my skin, it doesn’t stick out as much and make it look like I have 3 boobs. But, as I said - depends on the bra – the firmer the better. As for taking it out to bolus or check, well, looks kinda weird reaching down your shirt like that but, what the heck. Recently, my hubby and I were on a cruise with another couple and I wore dresses - long/short/strapless - quite a bit at night and that is where I normally put my pump. By mid way through our trip – the other husband started using the phrase “Boob-o-matic trouble” I haven’t had any luck with the armpit thing though - don’t find that very comfy.