textile antenna simulation

Hi guys ...... I am a final year B.tech student in amrita school of engineering. I am currently doing my final year project in textile /wearable antenna which works for the GPS band:1575.42Mhz and Iridium band:1616Mhz. I am using CST for simulation. I have simulated a rectangular patch with a polygon slot for attaining circular polarization. I am obtaining good results in CST. I have to simulate bending conditions for the antenna in CST. Can you guys suggest ideas for simulating bending conditions in CST ........... I am need of help .....Thank you