Could just be the brutal cutoff for doing anything with tailoring. I’ve had similar issues. I don’t like how often you tend to encounter a flat 0% success rate, with no way to influence it other than indefinite skill grind. But that just seems to be the state tailoring is in. I also don’t like how you can expend resources on a 0% success rate reinforce/refit and not even get exp for your trouble. It is wholly unintuitive.
It means your only option is to grind some other tailoring recipe to get where you need to be, which strikes me as very arbitrary and “gamey” (an issue that doesn’t usually afflict cdda). Breaks immersion for me.
Does seem weird that 10 isn’t enough, that’s almost certainly an oversight or bug. Could be that it’s damaged? But If you’re trying to reinforce I guess not.