Gentlemen prefer. . . what, exactly?
Can't be blondes, because this woman's obviously not, and yet she has their full attention.
Maybe gentlemen prefer bright, garish sweaters (the most logical assumption here, I think, given that this is a knitting booklet).
Of course, on the other hand, it might be that gentlemen prefer huge baskets of assorted tropical fruits. . .
. . . or brunettes with bizarre, gravity-defying hairdos. . .
. . . or women in high-waisted polyester pants. . .
I guess we'll never know. (Don't you just love the expressions on those two, though? And the way that one guy is leaning in a little closer?)