Is there a Hadith from Imam al-Sadiq (a) that states that a man should not engage in sexual relations with his wife while naked? If so, does this imply that only the man must be clothed, or does it mean that both partners should not be naked?
Bismihi ta'ala
There are narrations that do mention some of these things, but most of our esteemed scholars do not mention it as one of the makruh acts during intimacy, meaning that they might not hold that level of authenticity.
You must refer to your Marja' taqleed on this, but whatever the case is, it is not haram, nor even firmly established as 'makruh'.
And Allah knows best