Normally you can overproduce clothing and make three of every size or something, knowing that it only costs a couple bucks to make another shirt, for instance. And you can throw out if you make too many. If it's illegal to throw it out, maybe that raises the price from $2 to $4 because now you have to pay for storage for a long time. So you'll buy less inventory at the start, which usually means cutting less common sizes first