Actually, I'm the one who does not need to "know" if sin is possible after we are clothed with the imperishable. because I believe the power of the cross to reconcile sinners is eternal, and will continue to be efficacious after the resurrection and on into eternity. .It's @PaulThomson who wants to know if sin is still possible after we are clothed with the imperishable. I don't know why.
I'm actually looking forward to not sinning anymore as much as you are!
It is you and others like you who need to "know" that you cannot sin after the resurrection, because you seem to imagine there is an expiry date on the efficacy of the cross, so that if you do happen to fall short of perfect obedience in the next ages, you will have np remedy for your mark-missing.
I am very much looking forward to having the potential of not sinning any more.