CST - How to simulate shielding effectiveness for fabric shield?

Hello there, I have to perform analysis of shielding effects via transmission line analysis for multilayer and different materials which are copper and nickel at operating frequency below 1 GHz. Then, I have to make shielding effectiveness comparison via the transmission line analysis and results of simulation of shielding effectiveness via CST Studio Suite . I have not started as I don't know how to execute the shielding effectiveness simulation in CST. Should I design an antenna to represent the shielding fabric?