At least 10cm (4") too wide everywhere. So now the top is this:
To console myself, I decided to knit a discrete little project - some boottees for one of husby's friends. Nice quick knit with lovely Rowan wool cotton on my handmade-bought-at-a-country-market blackwood sticks.
I'll get back to the v-neck singlet shortly. At least I can safely knit a smaller size so hopefully it will go quickly. I'm really quite annoyed as I even did a swatch (and I hate swatching) and my tension was spot on. Oh well. Would rather have a top that fits!