Is it haram to pray shirtless in Islam?

Answer:

In Islam, it is not mandatory for a man to cover his shoulders or shoulder blades during prayer for the prayer to be considered valid. However, it is encouraged to do so as a form of beautification and in recognition of the sanctity of the prayer, given that he is standing in front of his Lord, Glorified and Exalted. Nonetheless, if a man chooses to pray without covering his shoulders, his prayer remains valid.