If there is one piece that we all have in our closets and is very, very affordable, it's a plain white T-shirt. I think we should have two models: one with short sleeves or sleeveless and strapless.
This article will come in handy, if you work in an office environment of 25 degrees Celsius that makes you feel like you're in the Maldives in the middle of winter. This is the case with me.