The Prophet ﷺ said, "None of you should offer prayer in a single garment that does not cover the shoulders." (Using translation from Bukhārī 359)
قَالَ رَسُولُ اللهِ ﷺ «لَا يُصَلِّيَنَّ أَحَدُكُمْ فِي الثَّوْبِ الْوَاحِدِ لَيْسَ عَلَى عَاتِقِهِ مِنْهُ شَيْءٌ»