Two Tunnels
That would be against the regulation set down in AP1358 Ch 6
0613. DPM Jacket.
A CS95 outer jacket may be worn with flying clothing, in place of a cold weather flying jacket, at the individual's discretion.
And also AP1358 Ch 2
0223. General. No 3 Service Dress covers all forms of operational clothing, including the Personal Clothing System Combat Uniform (PCS CU) and the Combat Soldier 95 (CS95) range (Woodland, desert and multi terrain patterns). Operational clothing is defined as clothing that is required to be worn for operations, operational training and exercises. Operational clothing is issued as part of the initial kitting scale for both male and female personnel. CS95 are issued and worn as authorised in the Air Command Guide to Kitting for Operations and Exercises, held by unit clothing stores. Instructions pertaining to CS95 remain extant until withdrawn from this publication.
With my
underline added...
I suggest you carry a copy of these extracts in your pocket
The B Word