TikTok’s Shein lookalike (that debuted last week) is no more; long live the Offline Boyfriend™; Gen Z fast-fashion fave PrettyLittleThing is launching a Depop-ish resale marketplace; where the cool kids partied during NYFW; Emma Chamberlain fronts PacSun’s spring 2022 campaign; Solange looks so good in Calvin Klein’s latest ad; and I’m trying and failin…