MOULTING CHOOKS - NOW???!!!??

Hi & Seasons Greetings    to one & all, not visited for some time but do hope you're all well & coping with the rotten weather that's been around (& from looks of it is returning). Problem I've got at moment is that NOW does seem to be a really stupid time for chooks to moult    - a couple did start to moult back in sept/oct and most seemed to shed a few feathers then but one in particular is now shedding so much she has bald patch on her back & also round her rump area whilst another has lost her beautiful tail (she's a leghorn) and is looking quite tatty as well.  Now whilst I realise that as this is their first moult (have has them 18mths since they were approx 16/18wks old), was under the impression that moulting should be over & done with, so do I need to give additional supplements (other than those they already get e.g. chicken spice, ACV) or should i make coats like those used for rescued batts or just let nature take its course?  Have upped amount of bedding in their coop so that they're warm at night and fortunately to date we've missed out on all the white stuff - just masses of white feathers!

I don't give them anything extra - I let them moult in their own time but I know others do give them extra protein, acv or poultry spice.

Chickens are strange wee things, suppose that's where the phrase, 'chicken brain' comes from

assuming they haven't got mites or lice or are being plucked by another chicken they will grow back 

I have three bare bottoms running around at the moment, I have checked for mites etc and reckon its moulting time.
I do give them some Battles poultry drink, not sure if it helps but they like it so they get it, plus I have bought it now.
Strangley tho, they are still producing eggs, I was expecting them to be off lay now but they are happily leaving me pressies every day.

I wouldnt worry about extra insulation as long as the coop isnt draughty, it needs ventilation of course, but not like a wind tunnel!
When i first gave one of my chooks a bath, i was supprised how long it took to blow dry her before putting her outside. Those feathers can trap some serious air, chickens are naturally very well insulated.