Wavy bands on a fine shirt pattern may come from capture or from resizing. First compare the original file with the exported file at the same displayed scale. Do not sharpen the entire picture until you know where the pattern changed.
Locate the first bad version
Inspect the original at full resolution. Then inspect the export at its native dimensions rather than only in a browser preview. If bands exist in the source, the capture already contains interference. If they appear only in one smaller version, the resizing step or viewer may be involved.
Make a small comparison sheet in your own notes: source, editor preview, full-size export and delivery-size export. Use the same crop of the garment. Comparing a large source against a tiny preview makes harmless scaling effects look like an editing defect.
Avoid a destructive correction loop
Open the image in Imagild's editor for ordinary tonal and local changes. Keep texture-oriented adjustments restrained. Strong sharpening may amplify the lines; broad smoothing may remove both the interference and the cloth weave.
If a dedicated moiré correction is required and the current interface does not offer it, use a specialist photo editor. A generative change can create a plausible textile, but that is not proof that it restored the exact original weave. For a clothing listing, replacement texture can misrepresent the product.
Test the intended output
A fictional team portrait needs a small website image and a larger brochure file. The small version shows bands on a striped shirt while the larger version does not. Test a slightly different export size and compare readability before altering the master. Record the version that works for each destination.
Ask the subject or product owner whether preserving the precise pattern is essential. For documentary or sales use, a new capture may be preferable to an attractive but invented repair. Review faces separately so a textile fix does not soften the whole portrait.