Tee Shirts with long sleeves
There are many reasons why people prefer these items. Firstly, because of modesty. Those wishing to adhere to the orthodox Halachic practices, will ensure that a woman's elbows and collar bone are covered. Another reason is protection from the sun, this is recommended for many outdoors activities including in wooded areas where the dangers of Lyme disease is prevalent. This is passed on by infinitesimal ticks and can cause long term symptoms, and so people engaging in outdoors activities are encouraged to wear long sleeved shirts.