As for the Standard Model, we now know that the roles of asymptotic freedom, monopoles, and instantons are crucial in our present picture of quark confinement, the hadron spectrum, the scaling phenomena, and jet physics. The renormalized theory allows us to reproduce the observed data on the Z and W bosons with unprecedented precision. The Standard Model, as a gauge theory with fermions and at most only one scalar, is indeed tremendously successful.
A theoretical foundation for the Standard Model has been established through the work of Yang, Mills, 't Hooft, Veltman, Faddeev, Popov, Fradkin, Tyutin, Feynman, Gell-Mann, Bryce DeWitt, Mandelstam, Slavnov, Taylor, Zinn-Justin, B. Lee, Gross, Wilczek, Politzer, Becchi, Rouet, Stora, Nambu, Goldstone, Higgs, Brout, Englert, Bouchiat, Iliopoulos, Meyer, and many, many others.
The Standard Model is so complex it would be hard to put it on a T-shirt — though not impossible; you'd just have to write kind of small.