"Tryon" is a specific term that refers to a process of wearing clothes before purchasing them. However, if you want to use synonyms for this term, you can use words like "test", "experiment", "sample", "evaluate" or "try out". These words can be used interchangeably with "tryon" in different contexts. For example, you can say "I am going to evaluate these clothes before buying them" instead of "I am going to have a tryon session before buying these clothes". Similarly, "I am going to experiment with different sizes" can be used instead of "I am going to do a tryon session with different sizes".