Let H be the number of hoodies Fiona owns.
Casey owns H + 2 hoodies.
Together, they own H + H + 2 = 2H + 2 = 8 hoodies.
Thus, 2H = 8 - 2 = 6 hoodies.
Therefore, Fiona owns H = 6 / 2 = <<6/2=3>>3 hoodies.
#### 3