1. If I buy clothes using money that was already Khums free, is Khums due on it if I don’t wear the clothes for a year?
2. Is the Khums due if I don’t use a gift/cloth every year or is it once in the entire time of possession?
3. How is the usage of an item defined? if I wear the clothes for just 1 day in the year, is Khums not due on it?

1) If something is purchased with money that khums has been paid on no need to pay it again.

2) If Khums is paid once, there is no need to pay it again, even if it stays for a few years.

3) Reasonable usage in a way that one could say I used this item. Trying it on does not suffice but wearing it does.