Cos Shirt - worn a lot but with great care except for a moment of acrobacy that was too much for the underarm stitches :D
As for all Cos items it has a special cut, square at the back but with elongated V-shape “tails” in front, they are made via pences under the chest.
Bottons down the chest, hidden
81% modal
I am terrible at mending so I hope someone is able to give it another life as the underarm is not a very visible area unless you start doing aerobics while wearing it like I did.
Size works for S and XS, let me know if you need measurements.