As Salamu Alaykum Ustadh. Does on make up many prayers from the past if they were possibly invalid? I had white clothing at work (medical institution) which was transparent to a degree. I often thought whether its covering enough or not. But i think it wasnt. I worked there for 9 months.

Ustadh AbdulAziz al-Haqqan

Your salah is correct, and you should not repeat any salah.