What are the specifications of the legitimate hijab, and is it permissible to wear wide trousers that resemble a skirt instead of an abaya, and is there any objection to wearing wide skirts?

The conditions for a woman's hijab are that it must be covering and not transparent, loose and not tight, and it must not resemble the clothing of men, disbelieving women, or immoral women. If these conditions are met in skirts or abayas, then it is permissible to wear them; otherwise, it is not. As for wearing trousers, its ruling has been previously addressed.