Student or Learner
My daughter wore a pair of blue socks to her kindergarten, when she came back home, she took them off and put on a pair of red socks. I couldn't find her blue socks so I asked her: "Where are your socks? " She answered: "They are on my feet. " I said: "I didn't mean these socks. Where are your socks that you wore to your kindergarten? "
1. Where are your socks that you wore to your kindergarten?
2. Where are your socks which you wore to your kindergarten?
Are "that" and "which" interchangeable here?
I would change the first "your" to "the", and remove the final "your". The "that/which" is optional. I wouldn't use it.
Where are the socks you wore to kindergarten?
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.