Extinguish the behavior by putting your shoes and slippers out of reach, teach your dog a take-it and drop-it cue, and give your dog plenty appropriate chew items.
That's exactly what I was going to say. In the old days it was a given that puppies got old slippers to chew. Heck my mum always gave the puppies I had dad's old slippers. These days we know better. With all those lovely smells on them shoes & socks are just what a dog loves.puppies chew-especially if it has your scent on it-don't leave your shoes where the puppy can get them