Blue and White Tzitzit
The Torah states in Numbers 15:38: "Speak to the Children of Israel, and say to them, that they shall make themselves tassels on the corners of their garments throughout their generations, and they shall put on the corner tassel a blue-violet (Tekhelet) thread." Wearing the Tzitzit is also commanded in Deuteronomy 22:12: "You shall make yourself twisted cords, on the four corners of your garment with which you cover yourself."