Best looking Warlock arms in D1 were Theosyion Vibrissae.
https://imgur.com/JdaQ7a0
Unfortunately the fact that shoulders on Warlocks are now dictated by the chest armor slot rather than the arms kinda precludes them from being brought back for D2.
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I mean they're okay but won't go with every look if you're going for a more soldier looking Warlock.