Res Mufti Sahib,
If a Hafiz wears shirt and pants can he lead Fard Salaat as well as Taraweeh Salaat, when he leads the Salaat he wears Jubba,
Wa Alaikum As Salaam,
Once he is properly attired for Salaah, then he can lead Salaah, and the Salaah will be valid.
And Allah knows best,
Mufti Waseem Khan.