If I had to keep my boys in a crate all the time in order to grow their coats I would quit. I do wrap and rewrap and wash and rewrap and wrap again. I spend lots of time wrapping. But you have to keep it clean and in oil to preserve the coats condition. If you have the time to dedicate to the process then you can find info and products that help. You may also want a wrapping jacket. Boys will urinate on their coats when they are really long so it is very important to keep it up and away. If you contact your local Yorkshire Terrier Club in your area they can be helpful in getting you started. I found my club and they have been wonderful. I am now a member of The Yorkshire Terrier Club of Greater Houston Area. The member have helped me find good Vets and Vet dentist, everything I needed to get started in show business.
One thing that was mentioned before, your boy may be on the larger size. The standard is under 7 lbs.
Good Luck, Hope you have fun with your boy