Hi Masters/Mistresses. Im a slave and have came up this punishment which may get you interested.
Get your slave to wear the same pants and socks (Maybe cloths) for a week, while making them exercise as much as they can sweating loads. Then after that week you can either smell them (I know people like that) or make them smell them. If you are cyber then you can force them to smell them.
And another thing is that you could make them not shower for that week too and get them really sweaty.
Hope you enjoy