I'm not sure if there is any halachic basis for any of this, but I've seen at most weddings the chasan just wears the kitul over the suit jacket. At a few weddings though, particularly in Israel, many chasanim wear the kitul underneath their jacket. Any reason for this?
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hebrewbooks.org/pdfpager.aspx?req=46545&st=&pgnum=116 – Gershon Gold Oct 28 '13 at 13:16
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According to R' Binyamin Shlomo Hamburger, Germans don't wear a sargenes (kittel) until a year after their wedding – Noach MiFrankfurt May 26 '14 at 21:14
A friend of mine was told by his rebbe at Chofetz Chaim yeshiva in Queens that it's a personal Yom Kippur -- hence, wear the kittel, but not out in the open.
The Lev Ita and Yismach Lev brings down the one should wear something ontop of kittel.
see it here http://thehalacha.com/wp-content/uploads/Vol4Issue12.pdf
