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Difference between kimono and yukata
If it's not summer, it's probably not a yukata. Yukata are very casual kimono meant to be worn in the summer or as bathrobes at places like hot springs.
If it's made of cotton it's probably a yukata. If it's not made of cotton it's probably not a yukata. You never ever ever go without socks with a kimono...except when you're wearing yukata. If the person you're looking at isn't wearing socks, the chances are much higher that you're looking at a yukata than a regular kimono.