it appears to have been surplus to a tailoring order and as such there's some small areas of wear near the front buttons where it looks like they'd planned to bring the jacket in a bit

Royal Engineer's Cap Badge

not just those of a pilot

Engraved Solid Black Buttons

from Lance Corporals right up to senior staff

British Royal Navy FR Combat Trousers - W30 L30 T Shirt it appears to have beenAt a glance 93% Meta Aramid, 5% Para Aramid & 2% Anti Static Blend Material 2 Slit Pockets w Zipper, 2 Large Cargo Pockets & 1 Rear Pocket Zipper Fly Button Closure 2" Belt Loops Durable & Heavy Duty Flame Resistant Drawstring Cuffs Solid Navy Blue Colour Waist Size: 30" Suggested Size: X Small Regular Label suggests fitting a waist around 75cm Inside Leg Length: 29" Short Label suggests a leg around 75cm Total Length: 41" Modern Militaria Issued