The importance of basics cannot be overestimated, and a t-shirt is one item you'll find yourself reaching for year-round. A basic t-shirt is invaluable for a myriad of of getups, from casual to classy chic.
If you're willing to splurge, then what you're looking for is Crew-Neck Tee. While you're at it, also have a look at this Pendleton Crew-Neck Tee. Yes, this item is expensive, but it does not mean it's not worth it. And one more item you might be interested in is Jil Sander Crew-neck T-shirt. 'Cause you deserve nothing but all the finer things!