Where can instructions for altering uniform clothing be found?

The correct choice is the Marine Corps Uniform Fitting and Alterations Manual because this manual specifically addresses the guidelines and procedures for altering uniform clothing. It provides detailed instructions on how to properly fit and adjust uniforms to ensure that they meet the required standards for appearance and function. This manual is tailored for those who need to understand the specific technical aspects of alterations, making it the most relevant resource.

The other options, while related to uniforms or dress standards, do not focus specifically on alterations. The Marine Corps Uniform Growth and Style Guide typically addresses design and aesthetic aspects of uniforms rather than fabric modifications. The Marine Corps Operational Readiness Manual is centered around deployment and operational effectiveness, which does not include uniform alterations. Lastly, the Marine Corps Dress Code Standards outlines proper wear and appearance guidelines, but it does not provide the practical instructions needed for modifying clothing itself.