Answer:
(Fatwa: 1652/1652/M=1431)
If no impurity is smeared on the said clothes and the part of body is covered completely, you can offer salah in that clothes. It is not necessary to change the clothes at the time of salah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
