Hopefully Grahame will apologise to me and Scipio for his offensive insults.
It is possible Jeremy wore a wet suit, shoes, gloves and a balaclava.
The other possibility is he wore the same clothes he arrived at WHF to meet the police with. He did have several layers of clothes on which would have protected him, together with a balaclava and gloves.
He may have worn neither for the massacre, wearing something totally different and changed after arriving back at his cottage.
Disposing of the massacre clothes was easy. Either on the night, or during the month later.