If you would like to have a go at making your own stamped labels there's a short how to below the gratuitous self promotion shots.
For the stamp pad I put a splodge of ink onto the lid, pop the felt piece over the top and use the back of the spoon to work it through the felt.
To make an even stamping surface, I used an old woollen blanket thrown on top of the kitchen table. Then I laid the calico on top of this and stamped a few rows of the business label. For the sizing labels I used the alphabet upper case stamps to spell out the numbers, then I wrapped a rubber band around them to keep them together whilst I stamped. Once everything was dry, I ironed them and cut them down to size. And that's it, easy peasy.
I'm pretty happy with how they've turned out, though I think I might get a dedicated clothing label stamp made up with 'little brown dog' and the wee critter himself.