Which of the following terms identifies the procedure for sizing a wig?

The procedure for sizing a wig is accurately identified as blocking. In the context of wig care and styling, blocking refers to the technique used to prepare a wig for proper fit and shape on a wig block or mannequin head. This process ensures that the wig is styled and designed according to the specific measurements of the wearer’s head, facilitating a more comfortable and natural look.

Blocking involves placing the wig on a designated form to maintain its shape while styling, and it can help prevent issues with the wig's fit. This step is crucial in wig customization, ensuring that the end product aligns well with the client's head dimensions and desired hairstyle.

Other options like trimming and measuring do play important roles in wig preparation and usage but do not specifically refer to the sizing aspect. Trimming typically involves cutting the hair of the wig to achieve the desired length and style, while measuring would refer to the initial step in determining the head size but does not encompass the full sizing procedure that blocking includes.