Sahds

Hi guys. I was wondering if anyone could give me tips on sewing a belt salwar. I have had a couple sewn by a lasy, but i dont know, they dont seem right. Hence, i want to start sewing my own clothes so i can have them exactly as i want. I sewed a chudidar pyjama last week, now i want to sew a belt salwar (ive realised it depends on the fabric, what kind of trouser you sew). Yeah, so hat are the general guidelines for sewing a belt salwar.. as in the circumference and width of the belt.. the scrunchy bits.. and how baggy etc it should be. Please help me! Detailed instructions would be a bonus