With regard to necklaces, it is not known that this custom is widely practiced among men without any objection; rather hardly anyone does it except effeminate men and their ilk, or those who imitate women or evildoers. So it is not permissible for you to wear it for that reason.

It is permissible to wear white, red, yellow, green, striped and other colours of clothing, and there was no difference of opinion concerning that, and none of them are makruh. It is also permissible for women to wear whatever colours they like, so long as they do not display themselves in front of non-mahram men.

If the shirt includes writing that is not prohibited but it attracts attention and distracts the worshippers who look at it, then it is disliked to pray in it in that case, otherwise it is not disliked. But if the writing carries prohibited meanings, it is not permissible to wear it at all, whether outside the prayer or when praying.

Just as it is not permissible for a Muslim man to wear natural silk, it is also not permissible for him to sit or sleep on it or to cover himself in it like a blanket.