It’s the shirt buttons that are baffling me. Those aren’t exactly high-tech, they require no fancy ores or computer chips, and they haven’t changed all that much in the last century. I know people who make them by hand, just for the fun of it.
Making them precisely enough they can be attached entirely by machine might be a little tricky, but not ridiculously tricky. There are even instructions online for making them from common materials like milk.
(No, seriously. Check it out: https://lizhaywood.com.au/making-buttons-from-milk-plastic/ )
There are no shirt button factories in Russia because it was much cheaper to import them by the millions.
Same thing with European cheese. Now, Russian cows make Russian cheese.
Sanctions have never worked.