It seems to be a recurring story that a set of shears taken to the wrong person come back ruined or at least in need of repair. The photo I have linked to shows the basic result you need to see when you get a pair of shears sharpened. There is a good reason why manufacturers of fabric shears or scissors finish the top cutting edge with a particular scratch pattern, it is so the fabric is gripped by the top and bottom blades without slipping down the blades. Now in particular if the fabric you are cutting is prone to slippage between layers, a pair of shears that have smooth edges, even if they are sharp will drag one layer against the other and will mess up the alignment of the cut.
When you find a person who can sharpen shears, the safest approach is to take an ordinary pair of scissors to them first to see what they work is like, it should look very much like the blade edge in the photo, the image is enlarged so you can see what the edge looks like but the edge is in fact reasonably fine in its scratch pattern. All professional shears are sharpened in this manner, some of the cheaper ones use serrations on the lower edge and they work OK but are very hard to re-sharpen unless you can take them back to the factory. You can in fact resharpen a serrated blade back to normal and it will work better if it has been done properly.
What to look for with people who sharpen shears.
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