The first bit (about relaxing jackets) is up to indivisual CO's and mine previously allowed us to do this. It was officially called "Number 4 Romeo's (4 R's)" and allowed non SSEP/HFEP to relax down to a blue/black cotton t-shirt which everyone apprecaited. The Gangway staff were in MTP.If the command allowed us to relax jackets when in tropical climes that you help. It is mentioned in uniform regs.
The fleece needs ditching and revert back to the wooly pully. I have seen the command do this but no one else. The RM still have their wooly pully for use with pcs.
Wolley Pulleys (I think?) are still issued so they can be worn with Number 3's, don't think it'd look too clever with PCS though, I do prefer the microfleece with PCS (but it's absolutely not fire retardent in any way!)