I have some 20 dress shirts in rotation from Jantzen. The earliest ones date from January 2005. These shirts are used for both in town work and also when I am on business travel. Some are already looking tired. Is that too short a lifespan for shirts? I am beginning to wonder if I should spend more on shirts and get good quality cottons (Swiss or English 2x2) and have them looking fresh longer, rather than retiring shirts every 1 - 1.5 years. What is your experience?