According to the pictures of the mission Soyuz MS-03, the crew is wearing a new "Sokol" space suit. The previous crew was still wearing the 1980 "vintage" KV2 version.
Any information about this new model?
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As far as I understand this is just a new overcoat as an additional insulation for cold environments, underneath wich they still wear their usual Cокол suit. It consists of several pieces which can easily be removed by opening some velcro strips.