They're the 4 special knotted strings that are attached to the corners of the tallit.
A kippah, tzizit and if 13+ tephilin in AM,and Talit in AM if Sephardi
It means "Who has sanctified us with His commandments and commanded us regarding the mitzvah of tzitzit." So basically, it's a fancy way of saying that you're thanking the big guy upstairs for giving you the rulebook on wearing fringes. Hope that clears things up for you!
The four articles of clothing that Jewish men wore are tunics made of linen next to their skin, In cold weather, they added wool or sheepskin cloaks. On their heads, they wore caps or turbans, and on their feet, they wore sandals. Names of clothing items Jewish men wore / wear include: Kipa (or Yarmulka), Kapata (long black jacket men wear after marriage) Black hat or Shtrimal (fur cap) Tzizit
Jews dress like any other group in the world, some modestly, others not. There is no specific costume worn. Jews of different movements tend to dress differently. Jews from Conservative, Reform, Reconstructionist, and Secular backgrounds typically dress like the majority of the region's non-Jewish inhabitants: Western attire in the West and Arab clothing in the Arab world. (Israelis dress in Western attire.) The Orthodox Movements tend to dress in Western Business Attire on most occasions, even if they are going to an informal event. Ultra-Orthodox groups have their own cloaks and suits specific to their local communities that have not been changed (in terms of appearance not the particular clothing items) for a few hundred years in accordance with custom.