Which pattern do I need for exactly this type of pants (harem pants)?

Hello, Assalamu Alaikum wa Rahmatullah I have a pair of harem pants here and would like to tailor/sew them myself because I like them. Does anyone out there who's a tailor know what kind of pattern I need for pants like these? JazakAllahu khayran (to the Muslims) and many thanks in advance to the non-Muslims!