A dynamical model for capture of irregular moons will be discussed. It identifies chaos as the essential feature responsible for initial temporary gravitational trapping near the planet. The key point is that incoming potential satellites get trapped in chaotic orbits close to "sticky" KAM tori in the neighbourhood of the planet, possibly for very long times, so that the chaotic layer largely dictates the final orbital properties of captured moons. We focuse on Jovian and Saturnian populations of irregular satellites and show that the observed clustering in inclination can be attributed to particles' chaotic capture history, rather than to fragmentation of a parent body due to collisions.