Is it forbidden to let one's garment hang below the ankles, and what is the reason for Abu Bakr Al-Siddiq's exception from this prohibition, and does this exception include those who are like him?

Scholars have unanimously agreed on the prohibition of isbal (letting one's garment hang below the ankles) if it is done out of khuyala' (arrogance or pride). They differed on isbal without khuyala', and the preponderant view is that it is absolutely prohibited. The exception made for Abu Bakr Al-Siddiq (may Allah be pleased with him) was not because he practiced isbal with an intention other than khuyala', but rather because he did not intentionally practice isbal. Instead, his izar (lower garment) would loosen due to his thin physique, and he would attend to it and pull it up. This is what the hadith clarified when the Prophet (peace be upon him) said to him: "You are not among those who do it out of pride." Thus, the excused person is one whose garment loosens unintentionally and he attends to it by pulling it up, not one who intentionally lengthens it and then claims not to be arrogant, because lengthening the hem usually indicates arrogance. Scholars have affirmed the general prohibition of isbal, and that restricting it to khuyala' does not change the general ruling of prohibition.