Haha I remember good ol’ Clairvoyant hat used to be like Ravager helmet. Good times.
Right now you’ll probably want Morgoneth set for best cold SS. @Superfluff posted a very good DW SS breaker before 1.1.5.0 (before Morgoneth), you can copy skillpoint distribution: [1.1.4.2] Loxmere's Daggerfall - SS Frostburn Spellbreaker - Expensive crucible build
For starters you could just use Silver Sentinel like every beginner cold build with nightblade. Or just change that Clairvoyant hat and roll with what you got. Copy devotions from this: [1.1.5.1] Demorgogoneth - 2H/DW Cold Shadow Strike Infiltrator