I've used the simple tee from New Look 6216 again.
I used a mystery ivory knit from the fabric resources. This isn't a proper white (which is too bright for me) but is my version, slightly softened and not too yellowy.
I seem to make at least one ivory tee every year, and by the next year I need to make it again.
They get worn and washed a lot and seem very prone to getting stained so I need to keep replacing them.