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What does this French article mean?

A joke

Ms. LeBron just bought the same clothes for her twins. The two children put them on at once. Ms. LeBron asked the shop assistant:

Do you have a fitting mirror?

Why do you want a fitting mirror? The salesman replied. They just looked at each other.

PS: The last sentence is not translated well, but that's what it means.

There is a fitting mirror. Is there a place to look in the mirror? I feel that the fitting mirror is more in line with China people's speaking habits.

If you don't understand anything, if it's not urgent, you can leave QQ and I'll add you. You can ask me if you don't understand anything in the future. There must be no official translation. The translation is good, but the general idea is no problem.