Yeah, couldn't agree more with this. Poe's TLJ outfit is as generic as they come, and Finn's isn't much better. It's like they looked at Han Solo and decided that every man in the galaxy dresses in an off-white shirt with a weird collar, with a jacket over the top.
I know they've gone the whole Resistance route so the good guys can be plucky, underequipped underdogs (again) but Poe at least is supposed to have been a pilot for the Republic. Couldn't they have given him an outfit with more of a military cut? Or something more like Luke's ESB jumpsuit?
Costuming so far has been all over the place in the sequel trilogy. They absolutely knocked it out of the park with Luke. If you'd asked me to describe my perfect 'Jedi Master Luke' look, it still wouldn't have been as good as what they came up with. Kylo Ren has a really interesting look, and Rey's outfit really suits her character. But absolutely everything else (so far) has been rubbish. How can they have got one or two things so right, then been so utterly uninspired for everything else? IMO, of course. I know some people dig the First Order uniforms, for example.