«هُنَّ لِبَاسٌ لَكُمْ وَأَنْتُمْ لِبَاسٌ لَهُنَّ»
They are a garment for you, and you are a garment for them.
Two coordinated clauses reverse the participants while maintaining the same metaphorical image. The garment suggests closeness, protection and privacy, with the reciprocal construction distributing these qualities to both sides.
Reversal of the grammatical relationship expresses mutuality; it is not merely wordplay. The effect is found by examining both syntax and imagery.