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In page Frock coat:

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Most Hasidim wear long coats called rekelekh during the week, which are often mistaken for frock coats but are really very long suit jackets. On Shabbat, Hasidim wear bekishes, which are usually silk or polyester as opposed to the woollen frock coat. The bekishe and the rekel both lack the waist seam construction of the frock coat. Additionally, bekishes can be distinguished from frock coats by the additional two buttons on front and a lack of a slit in the back.