find lots of silly knit fabrics, cut blocks, sew them together into large enough peices to lay pattern pieces down on, cut out your pattern and make the pants. greenpepper has lots of patterns for elastic waist (fleece) pants one of those patterns would probably work well. remember when using knits to use a stretch needle (ball-point) and a stretch stitch (zig=zag) we havent made any with regular knits but we've made quite a few fleece pairs. and i've made quilted clothing by just piecing fabric big enough to cut out patterns. works well and is very unique :)