A new series and what an appropriate one to begin with (Strictly speaking, Wikipedia says, an anorak is a waterproof, hooded, pull-over jacket without a front opening, and sometimes drawstring at the waist and cuffs.)
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.