Is it permissible to wear trousers with a jacket below the knee in winter to avoid the difficulty of wearing a skirt, and what are the conditions for this, taking into account the love of elegance and the difficulty of finding suitable items in stores?

If the trousers meet the conditions of the Shariah-compliant hijab, meaning they are loose, do not describe, and are not transparent, and the woman wears over them a covering garment, then there is no harm in wearing them. The preference remains for the woman to choose clothes that suit the conditions of the Shariah-compliant hijab.