weave question...

Im getting a partial weave put in. Its going tp be straight remy hhair. My hair is naturally a little wavy but i straighten it. Its a slight wave that straightens a little when combed. Im Caucasian by the way if it matters. If my hair unstraightens from sweat or if im in the rain or something will it look weird? Like will it still blend in? And can someone recommend straightening serum that will help it stay straight?