Your puppy is teething and has an insatiable desire to chew.  You cannot stop this behavior, but you can certainly direct your puppy to chew upon acceptable items until this phase passes (at about a year of age).  The only way puppies know how to play is the typical wrestling, biting, chasing, tackling, pulling, and nipping they do with littermates.  In the absence of littermates, you and your family suddenly become the littermates.  Each and every time your puppy puts its mouth or teeth on your clothes or hands, you immediately need to remove the teeth from the object, firmly close the puppy’s mouth with your hand, and firmly, deeply, and loudly say “NO”.  Your puppy will undoubtedly nip/bite at you again.  Repeat this same disciplinary action a total of three times in a row.  After the third disciplinary action, distract your puppy by giving him/her something he/she can chew upon.  Every now and then, a particularly feisty puppy will become more excited by this disciplinary action and need a more distinct disciplinary measure.  This next action needs to be initiated quickly.  When the first three disciplinary actions don’t seem to work, you can use another technique that may be more successful.  Immediately upon your puppy putting his/her mouth on you, put your thumb on the tongue and your other fingers underneath the jaw and press down on the tongue.  This will be uncomfortable for your puppy.  When behavior meets with uncomfortable consequences, the behavior will stop.   Another option is to mix 30% white vinegar and 70% water in a small spray bottle.  Spray this in your puppy’s face each time he bites at you.  It would benefit your dog greatly to find a playmate that he can play and wrestle about with  to get that playful puppy energy out.  A tired dog is a good dog and excercise during play is the best form of this for a puppy. The bottom line is that your puppy needs to have active playtime each day.  It is your job to find or create activities that are fun for your puppy and that tire him/her out.