In a theatrical production, when does the costume designer take measurements of the actors?

In a theatrical production, the costume designer takes measurements of the actors at the first read-through.

Explanation:

When all the actor and director get together for the read-through, the actors read through their lines with the director and check all sort of doubts or suggestions they may have in order to create a more rounded character and play, the costume designer takes the measurements of each performer in this meeting to be aware of the kind of movements and personality of each character and to make sure that the costumes will be functional and fit correctly.

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