Definitely worth adding, mighty fine growth

As for the summer time bra conundrum, I felt the same last summer. Admittedly I dont wear the typical wired/unwired bras, as I found seamless bralettes are much comfier and far less obvious under a summer tee. 
Last summer, I reckon I had maybe 3 second glances from strangers that I noticed  and absolutely no one - friends, daughters or family said or took a second glance at all.
I think what helps is they are pretty stealth being seamless so the outline under a tee just looks like a vest.

I'll be doing the same this summer, and even though they feel a LOT fuller I'm hoping they stay in stealth mode LOL