To complain that these samples could have been made and delivered months ago is a stretch to say the least.
Why is that a stretch? KBLB doesn't produce "traditional silk", which means it was purchased. I don't remember the world ever being out of stock of silk or cotton, so this literally could have been purchased years ago, so months ago is in no way a stretch. And this is all assuming that KBLB had the raw cotton thread and silk thread woven for them. They could have just bought the fabric in whatever ratio silk to cotton they wanted.
In fact, anyone can go to google and buy silk / cotton blended fabric by the yard, in any percentage of silk vs cotton. I'm pretty sure that's all they did, so what took so long? This should have been done as soon as the Kings KBLB partnership was announced with the intention to produce self-designed clothing using silk / cotton blended fabric.