Hi, I am a true newbee…I have knitted washclothes and recently my grandmother passed away and left me with her slipper pattern. I am excited to carry on the tradition on holiday slippers, but I need a bit of direction. First, what would be a good yarn? She used regular yarn (the stuff there is most of 
) But, mentions in her pattern to double the yarn so that they are thicker and warmer. Is there a yarn that I would not need to knit two strands at a time? Thanks for your help.
Welcome!
There really isn’t any yarn that could be considered regular yarn. 
Do you mean inexpensive acrylic like you get in craft stores? Anyway, you can probably use a chunky or bulky yarn in place of two strands of worsted. 
Lion Brand makes some I know.
I’m gonna go ahead and guess she means worsted weight since it’s the most common.
Ahh…probably good guess, Meow.
Well, we still need to know whether you want wool, acrylic or what?
i just finished makeing a sweater for my baby … i used wool ease thick and quick… its a #6 yarn witch is very bulky so i dont think you would have to double up for your pattern… they have a ton of colors to choose from and its very soft … might want to put something on the bottom for traction if the person you are giving em too has hard wood or some other slippery type of floors …