Salams dear brother it happens, my husband and son have had their new shoes for Eid stolen a number of times when they go to pray the Eid prayer, people pass by and take their pick, astaghfirallah, thats the times we are living in,
on another note brothers should go to the masjid clean ( they are not allowed to haram other muslims , even with bad smells etc)and wear something long enought to cover their awra( between the naval and knee ). I good idea to keep a thawb in your car etc for pray and of course it would be right for the brothers to always have decent right clothing on at all times,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
And Allah ta'laa knows best