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The universal Ashkenazi minhag is to wear the kittel on Yom Kippur.
I have heard of some who wear the kittel also on Rosh HaShanah. Is this a true minhag? I suspect it might be a Jeckishe (German) minhag, but I'm not so sure.
Charnobyl dynasty followers wears kitel on Rosh HaShanah, it is their minchag.