It doesn't say that in 265 because it doesn't have to. However...as I said...read the mbr's VOT Offer and VOT Instruction Messages. I linked to an example in my post above....but for ease: (pertinent parts in yellow)
1. SUBJ MEMBER HAS BEEN SELECTED FOR VOT TO MOSID 00337-01 AC OP
2. THE FOLLOWING CONDITIONS APPLY:
A. EFFECTIVE DATE: 15 JUL 15
B. RANK: CPL. SENIORITY AND EPZ IAW REF A
C. PAY: IPC IAW REF B AND C. POC FOR PAY DETERMINATION IS DPPD 2 CSN: 992-0972
D. QL: QL0 (UNLESS PLAR INDICATES QUALS FOR TARGET OCCUPATION)
E. POSTING: MEMBER WILL BE POSTED (NO COST) TO NEAREST BTL UPON EFFECTIVE DATE
F. DEU: CHANGE TO AIR (MEMBER MUST BE ISSUED COMPLETE DEU PRIOR TO OT EFFECTIVE DATE)
7. VOT INSTRUCTION MESSAGE WILL BE ISSUED BY DMCPG 5-3 OCCUPATION TRANSFERS UPON RECEIPT OF ACCEPTANCE MESSAGE AND PLAR RESULTS (IF APPLICABLE). NO ACTION AUTHORIZED UNTIL ALL CONDITIONS OF THIS OFFER HAVE BEEN MET AND THE INSTRUCTION MSG HAS BEEN ISSUED END OF ENGLISH TEXT
If you are looking for a ref that says "you will wear the DEU assigned to you", the only thing I can find quickly (because, IMO, the above is all you really need...) is the following from CFP 265 CANADIAN FORCES DRESS INSTRUCTIONS:
Chap 1, Para 16 (Definitions)
Air Force. Means personnel allocated an air environmental identity and the ceremonial, mess and service dress which matches that identity.
Distinctive Environmental Uniforms (DEU). Means uniforms which identify the personal, permanent allocation of CF members to one of the three functional environments.
Chap 2, Sect 1, Group and Individual Identity
8. Overlaying the organizational system is one for personal identity, i.e. identifiers which indicate personal qualification, experience, and “family” memberships. These include branch, occupation,
and flying and specialist skill badges; rank insignia; decorations and medals; and DEU.
9. CF members are allocated environmental identity and uniformed according to the functional branch to which they belong, with each branch manned by individuals from one or more environments.
Summary; IAW the mbr in question's VOT Offer message, and the VOT Instruction Message, on their VOT effective date, they will no longer belong to their former unit (posted to the BTL on XX Jul 15). They will also be allocated the RCAF DEU, effective their VOT date of XX Jul 15 and that is the DEU they are then authorized to wear.
The mbr's unit can say what they want to now, but come end-Jul, they won't be the mbr's "unit" and the member won't be a member of their current branch, trade or DEU at that time. They will allocated the RCAF environmental identity on the VOT eff date and "uniformed according to the functional branch to which they belong".