I prefer a tight neck shirt, which I know isn’t for everyone. A shirt that was very popular was the American apparel 50/50 shirt. Gilden bought the company a few years back and shut it down. Apparently a few companies have started making a clone, notably Los Angeles apparel, but it’s fairly expensive. I heard wholesale pricing isn’t too bad though. Also, as colour is another popular option. I have been researching shirts to convert my wardrobe but I am not a big fan of all the cheap options out there.