Items of clothing and other textiles can be equipped with a variety of functional or decorative garment accessories. These garment accessories impair the purity of textile material flows and pose challenges in the context of automated NIR sorting of waste textiles. This thesis therefore systematically documented how frequently accessories occur in certain clothing categories (e.g. pants, T-shirts, shirts). In the future, this data can be used as a basis for further research and to estimate the amount of impurities in sorted material flows. In addition, selected textiles with various garment accessories were initially examined using FTIR to determine the composition of both the garment itself and all accessories. It was found that almost all examined textiles had at least one polyester contamination originating from garment accessories (e.g. sewing thread, labels or zippers). Finally, it was examined which garment accessories could be detected using automated NIR sorting technology or could be problematic in the context of detection. It was found that components such as sewing thread or labels were not sufficiently recognized, while buttons and other plastic fasteners were qualitatively well detected by the NIR spectrometer.