In this perspective, we discuss how to perform simulations of ECD and CPL spectra for chiral oriented systems in the solid phase. These materials have attracted increasing attention for a variety of technological applications, including optoelectronics, sensing, magnetism, information technology, and imaging. Experimentally, the characterization of the materials virtually always includes ECD spectroscopy, while strong CPL is often a sought-after property for applications in devices. Theoretical simulations that can help interpret the experimental spectra or predict structures with specific chiroptical properties are extremely desirable. However, so far these simulations are based on molecular calculations on individual chromophoric systems or on exciton coupling models between two or more isolated chromophoric units. These models are powerful, but they rely on stringent assumptions that are not always valid (e.g., do not work when electron conjugation extends across chromophores).