"Which shoes are yours?"
Translation:Quelles sont tes chaussures ?
Hopefully a native speaker will see this and tell me if it is correct, but for now I believe there are 2 problems:
1) "Lesquelles" is a pronoun (except in strange cases), not an adjective so you won't want to use it to modify chaussures like you have in your sentence. If you want to say "which shoes" then you want to use an interrogative adjective (just "quelles")
2) Since it is a noun, you can't just say "vôtres" you need to include its article, so it would have to be "les vôtres"
All together, you should be able to say: "quelles chaussures sont les vôtres"