What is the ruling on selling half-sleeved shirts to men in a non-Islamic country, and is selling them considered imitation, knowing that such clothes are acceptable for both genders in that country and are of an Arab Eastern nature, and are neither transparent nor tight?

It is permissible for a woman to wear short-sleeved blouses in front of other women, and for a man to wear them, because the forbidden imitation is the wearing of what is exclusive to women. It is permissible to sell them to men. As for selling them to women, the original ruling is permissibility, unless it is known or highly probable that they will be used for ostentation in front of men. In such a case, it is not permissible to sell them to women, and this would be considered assisting in sin.