I thought my son needed a 9 slim pant because 8 slims fit him in the waste but are too short.  10 slims swallow him but are a good length.  We ordered these and when he tried them on they were too tight...even in the waste...so we had to return them.  They must run small.  They looked to be great quality, but their sizes must run small.  If I didn't have to order them and go through the hassel of returning them if they didn't fit, I would order the 10 slims to see if they would be like a normal 9 slim.  I wish more stores would come up with odd-sized clothing!!