What would be the best way to make this scifi suit?

Before you extrude, make the whole line, then bevel it. Now it has even thickness



I’ve retopologized the lighter section and marked it as a seam. I now want to fill in the rest but when I use polyquilt’s smooth function to spread quads evenly it shifts the seams too. Is there a way I can lock the seam vertices in place?

I don’t know about polyquilt, but does it work if you hide the seam’s vertices? That would work with a lot of tools in Blender.

If it can’t be done with polyquilt, it could surely be done with loop tools. It would be a bit slower, as you would need to select the loops to work on, but you can work on very specific sections of a mesh with that addon and it does have a nice relax tool.

You can also assign different Face Sets from edit mode selection and use Relax Slide sculpt brush with Face Sets auto-masking.