Is your whole team and factory clear on what size you are sampling? If not, you could find yourself having to get your patterns regraded or even end up with wasted samples. (Let’s hope everything got sorted out before production!)
It seems easy enough to be on the same page about the sample size, but it is not as straightforward during development. With a new style, sizes likely haven’t been established yet so you are just dealing with the base size pattern. The fit samples might not have labels in them indicating the size. You don’t want one person assuming the sample is a M while another making decisions assuming it is a S.
If you change fit models, have a unique sizing system for your brand, or find yourself saying “this sample fits more like a [other size]”, it is a good time to confirm with your patternmaker and factory what your sample size is.