The dwarven physique, for both genders, tends toward stockiness and generous measurements - barrel chests, broad shoulders, thick arms, and sturdy
legs for the males; and ample bosoms, thick waists, wide hips, and round rumps for the females. While, with a particular diet and exercise regimen, it would be theoretically and technically possible for a "thin" dwarf woman to exist, in much the
same way that it would be technically possible for a "fat" elf to exist, none of either have ever been seen, and the requirements to produce them
would leave the subject dangerously unhealthy with regard to the norm for their race on both cases.
Hence why Gatty is a fatty and Tol is a stumpy boulder on legs.