Answer:
(Fatwa: 267/270=L)
It is unlawful to wear pyjama etc below ankle though without the intention of arrogance. If one wearsit out of arrogance then it has double sin; one for wearing below ankle and second for arrogance. (Extracted from Imdadul Fatawa: 4/122)
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
