Perhaps we just have to embrace the wrinkled décolletage, bingo wings and less than taut abdomen ladies? 
I share your frustration. My bug bear is the clingy, stretchy, thin (and cheap) fabric so many t shirts and tops are made of. This has been going on for some time now. They are one step away from the dreaded bri-nylon. They hang dreadfully, show every lump and bump, make me sticky and sweaty and flatter only the stick thin. Even the slimmest girls seem to have back-fat when wearing these clingy cheap-looking abominations!
Oh for a bit of decent tailoring and quality material. I too loathe sequins, slogans, polyester, cutesy animals or any unnecessary embellishment. How I long for a decent 100% cotton, well cut, well made T shirt that doesn't cost a king's ransom.