I purchased the LF2 sweater and jeans set on sale to test it in the Cloth Room.  I ran a simple simulation, starting with the basic pose in frame 1 and ending in frame 30 with the same pose you used in your sim.  As far as I'm concerned, everything working as it should.  The results are below.

                                                                   

A major problem I am seeing in your sim is her hair.  Are you accounting for the hair in the simulation?  That might be causing simulation failure.  Normally, I run simulations first without any additional content and then create the scene in the final frame of the simulation.