I've honestly been underwhelmed with the cheap slapped together look Xenomorph Yautja Halloween costumes, I've come across, most of which are so rubbery, plastic, clothe, damageable material, poor proportions, poorly fits, lacking details, there no comparison to the quality detailed movie accurate cosplays that skilled fans have made some even on par with professionals. I'd rather save up and purchase the materials and produce a cosplay outfit that matches the film's aesthetic authentically.
However the intent of a Halloween costume isn't to be objectively convincingly realistic but for the fun of it, so in that respect it's harmless.
