Answered by: Moulana Imran Mughal
Assalamu Alaikum Wa Rahmatullah
If ghusl becomes fardh upon me and after I go to the toilet and wash my private area and inner thighs properly (I don’t do complete ghusl) and then I wear clean bottoms will the bottoms become impure as I am in need of ghusl or will they remain clean?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of ALLAH the Most Gracious, the Most Merciful.
Assalamualaikum Wa Rahmatullahi Wa Barakaatuh
If ghusl becomes fardh on someone the impurity does not transfer or spread on to their clothes. So, if they were to spend time in those clothes or even sweat in them, the clothes will not become impure.
Only Allah SWT alone knows best.
Written by Moulana Imran Mughal
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Allamah Sarakhsi, Al-Mabsoot(Quetta: Maktabah Rashidiyyah,), 1:189-190.
This answer was collected from DarulIftaBirmingham.co.uk, which is run under the supervision of Mufti Mohammed Tosir Miah from the United Kingdom.