  We consider a simple rescattering mechanism to calculate a leading twist
$T$-odd pion fragmentation function, a favored candidate for filtering the
transversity properties of the nucleon. We evaluate the single spin azimuthal
asymmetry for a transversely polarized target in semi-inclusive deep inelastic
scattering (for HERMES kinematics). Additionally, we calculate the double
$T$-odd $\cos2\phi$ asymmetry in this framework.
