I know people are always asking for long things.
I'm really short in the body so it's not a problem for me.
However, I have just hung DD2s size 6 Primark vest next to DD1's size 12 M&S one and it's miles longer (even though, having minimal norks DD2 pulls the straps on adult sizes really short).
Since they are dirt cheap and wash really nicely I thought Primark vests were worth the thumbs up.