I used to take two shirts for a 4 day trip. 1 shirt seems to work well for a 4 day. A lot easier too. In the summer time I will usually take two shirts for a 4 day, especially when flying that sweat box called the CRJ200.

I also remember from middle school art class, that the brightest whites have hues of blue. Dingy looking whites have hues of yellow. Add some bluing fluid to your wash.
Mrs. Stewart?s Bluing ? WHY bluing for whitening fabric?