Starting with an investigation into the word "beged," or garment, that would become impure and perhaps need laundering. With a discussion of that which is susceptible to impurity, with 3 scenarios to distinguish between what is "fit" for impurity and what is in fact becoming impure. Size is relevant, and so is how plain the garment is - if it's supposed to be embroidered and is not as yet, then it is not finished and not fit for impurity (but if it is supposed to be a plain garment, it would be). Also, moving back to the laundering question - specifically with regard to leather. With a biblical teaching that leather is relevant, but also a key distinction is made between soft leather (garments) and hard leather - and also between laundering that involves water and rubbing to clean the item, as compared to water alone.