Rabbits will nibble each others fur when grooming each other, so it sounds like your little bun is just trying to groom you. To discourage the nibbling you can make a loud 'eek' sound, to show it hurts. You can also flinch and pull your hand away, like another rabbit would do if the nibbling was hurting. And reward the bunny with pets when it licks and grooms you properly.
Digging at clothes can be a way to get your attention. It may mean 'pet me', 'move your leg', or 'I need to pee, where's my litter box'. It can also just be something they do because they like digging at fabric and cloth, to rearrange it. If that's the case, you can give your bun a fleece blankie to dig on and play with. But beware, a lot of bunnies LOVE to pee on soft things, even after they are properly litter trained. If you want to discourage digging at your clothes, which I would suggest, you can do a little clap and tell your bunny 'no', or move you bunny away from doing it and tell it 'no'. You'll just have to see what works for your bun. Some discipline methods don't work for some rabbits.