Martha can be seen wearing this outfit in episodes 5 and 6 of season 4 when she is panicing over being found as being a spy.
It is a 6 piece outfit which consists of the following-
A large brown Theory jacket.
A brown belt with large bronze buckle
A blue blouse with the brand tag taken out. It buttons up at the next and has shoulder pads.
A brown size 14 Harve Benard 100% wool skirt, it has some slight fraying.
A multi colored wool scarf
A maroon Galitzine purse, which Martha can also been seen with in prior episodes such as episode 3 of season 4.