Cold weather active clothing ??

In June I'm doing the Larapinta Trail (5 other forum members are sharing the transport so they might also get something from this thread)
So here's my torso clothing list, I'm just unsure on the early morning's and windy ridges if it will be enough.
Never before have I experienced the desert cold winds and temperature extreme's all in one trip.
Leg's, feet, hands, head, All good and I'm confident with my clothing for those area's.
In camp at night I'm not that worried as I'll have plenty of down to wrap myself in.
It's just this cold active thing I've never really had an issue with, looking at others who have done the Larapinta it appears they are wearing a lot of clothes on some of the hills and ridges.
I've done plenty of colder trips, Kosci Main Range, Tassie, NZ, Barrington tops etc. Always in pretty decent weather though by chance. I guess I just haven't been smashed with completely feral weather when a baselayer and shell is inadequate.
I'll be wearing the usual shirt - Rab MeCo 120 Baselayer (65% Merino / 35% poly)
Spare warmer baselayer / mid layer I will have a grid fleece hoodie. It's actually a NW Alpine Spider Hoodie, It's a tiny little bit lighter than 100wt fleece.
For main insulation I'll have my Blackrock down vest and sleeves. This I know is warm, All up there is 3.8oz of 900 fill in the sleeves and vest. Obviously though this is not an item that I would wear whist moving or when I'm still sweaty etc. Wet down = bad.
I'm taking a windshirt which I have found very good ontop of my Rab shirt in cold weather locally. This is a Montbell Tachyon Anorak hooded jacket.
And for a light rain shell I'm just taking my OR Helium II.
So for those with more experience in icy winds etc do you think the Rab baselayer, light fleece hoodie and windshell will be enough whilst active or slightly at rest for the odd break ??
I'm yet to experience conditions where I have needed the fleece whilst active but it has been mighty handy when stopping for breaks.
Do people find themselves either on the Larapinta or even in the snowy peaks of Tassie actively walking wearing fleece under a shell jacket of some kind ??
I do have a light synthetic fill jacket I have just purchased which I could take for breaks etc but I just think that would be insulation overkill.
So here's my torso clothing list, I'm just unsure on the early morning's and windy ridges if it will be enough.
Never before have I experienced the desert cold winds and temperature extreme's all in one trip.
Leg's, feet, hands, head, All good and I'm confident with my clothing for those area's.
In camp at night I'm not that worried as I'll have plenty of down to wrap myself in.
It's just this cold active thing I've never really had an issue with, looking at others who have done the Larapinta it appears they are wearing a lot of clothes on some of the hills and ridges.
I've done plenty of colder trips, Kosci Main Range, Tassie, NZ, Barrington tops etc. Always in pretty decent weather though by chance. I guess I just haven't been smashed with completely feral weather when a baselayer and shell is inadequate.
I'll be wearing the usual shirt - Rab MeCo 120 Baselayer (65% Merino / 35% poly)
Spare warmer baselayer / mid layer I will have a grid fleece hoodie. It's actually a NW Alpine Spider Hoodie, It's a tiny little bit lighter than 100wt fleece.
For main insulation I'll have my Blackrock down vest and sleeves. This I know is warm, All up there is 3.8oz of 900 fill in the sleeves and vest. Obviously though this is not an item that I would wear whist moving or when I'm still sweaty etc. Wet down = bad.
I'm taking a windshirt which I have found very good ontop of my Rab shirt in cold weather locally. This is a Montbell Tachyon Anorak hooded jacket.
And for a light rain shell I'm just taking my OR Helium II.
So for those with more experience in icy winds etc do you think the Rab baselayer, light fleece hoodie and windshell will be enough whilst active or slightly at rest for the odd break ??
I'm yet to experience conditions where I have needed the fleece whilst active but it has been mighty handy when stopping for breaks.
Do people find themselves either on the Larapinta or even in the snowy peaks of Tassie actively walking wearing fleece under a shell jacket of some kind ??
I do have a light synthetic fill jacket I have just purchased which I could take for breaks etc but I just think that would be insulation overkill.