You really can't go wrong with a navy t-shirt on. Trust us on that one.
This navy t-shirt is even better, as it is subtly branded, to leave those nosey friends where you got it from, but it is also sustainable. Not Primark or H&M's version of sustainable, but our version. It is carbon offset, comes from Portugal, not from half way across the world, and is such high quality that it will be in your wardrobe for years.