↓ Transcript
Panel 1:

PENNY: (with a forlorn expression) Hrnn...
MARIE: What's wrong, Pen-Pal?
PENNY: It's just this sweater.

Panel 2:
PENNY: I started it before I got on my fitness kick.
MARIE: What's wrong with that?
PENNY: I'm knitting it as a XXXL. I don't want to be that size by the time it's done.

Panel 3:
MARIE: So just knit it the size you want to be.
PENNY: But what if I lose too much? Or not enough? I'd have worked for months on a sweater that I can't wear!

Panel 4:
PENNY: It's like Sophie's Choice!
MARIE: No...It's really not.