'Camouflaging' is a set of strategies used by autistic people to hide or compensate for their autistic characteristics to fit into predominantly non-autistic social environments. Many researchers have used the Camouflaging Autistic Traits Questionnaire (CAT-Q) to measure camouflaging. However, there have been questions about the construct validity of the CAT-Q as a measurement of camouflaging. The present study examined the extent to which CAT-Q items were distinguishable from other theoretically and empirically related measures of social anxiety, fear of negative evaluation and autistic social traits. Autistic adults (N = 308) completed the CAT-Q and social anxiety, fear of negative evaluation and autistic social traits measures. The small-to-large positive associations between camouflaging and social anxiety, fear of negative evaluation and autistic social traits (r = 0.14-0.65) were not indicative of collinearity. Three exploratory factor analyses, in which CAT-Q items were factor-analysed together with social anxiety, fear of negative evaluation and autistic social traits items respectively, showed that CAT-Q items generally loaded onto different factors from social anxiety, fear of negative evaluation and autistic social traits items, with the exception of the CAT-Q Assimilation subscale items, which cross-loaded mostly with autistic social traits items. Overall, the CAT-Q items were positively associated with, but also differentiated from, most social anxiety, fear of negative evaluation and autistic social traits items, providing support for the measure's construct validity.