UV radiation and solar radiation in general is a major problem regarding textiles wear. Textiles generally fade under direct or indirect light. The extent to which this bleaching occurs over a certain period of time depends on the quality of the textiles.
The light fastness of textiles can be measured. A frequent test method is DIN EN ISO 105-B02.
Standards: DIN EN ISO 105-B02, DIN EN ISO 105-B04, DIN EN ISO 105-B06, DIN EN ISO 105-B07