You're looking at the irrefutable proof that a turtleneck and sweatpants are amazing when paired together in a casual look. Consider a pair of white leather low top sneakers as the glue that will pull this ensemble together.
Turtleneck with Sweatpants Cold Weather Outfits For Women In Their 20s
Breathe variety into your current casual repertoire with a turtleneck and sweatpants. As for footwear, complement your outfit with a pair of white leather low top sneakers.