Tallit (The Prayer Shawl)
The corner fringes on this ritual garment remind the wearer of all the commandments in the Torah.
By Rabbi Louis Jacobs
The textual basis for the practice of wearing a tallit only during the daylight hours is a phrase in the passage from Numbers 15 that establishes this mitzvah: “…and you shall see it, and you shall remember all the commandments of the Lord and observe them…” The words “to see ” are traditionally interpreted here to imply a daytime obligation only–that is, during the time when one can “see” the fringes referred to, which are attached to the tallit.Reprinted from Louis Jacobs, The Jewish Religion: A Companion, published by Oxford University Press.
Main Article link:
http://www.myjewishlearning.com/practices/Ritual/Prayer/Ritual_Garb/Tallit_Prayer_Shawl_.shtml?p=1
Why do we wear Talit only For morning Prayers:
Talit Q&A
http://www.chabad.org/search/keyword_cdo/kid/16013/jewish/Tallit-Prayer-Shawl.htm