Sleeping bag re-sew Size increase

I spend more time bivvying because of over estimating my fitness and health than somebody as experienced as I am should.
So a while ago I started carrying a LW bag as well as my bivvy sack.
It's a great bag for an Op-Shop $8- but I have never been able to do up the zipper if I wear my usual winter spare layer, a Patagonia DAS in XL.
Yesterday I disassembled the bag to start the process of changing it into a centre zip arrangement and to make sure I got it right I got my beloved to measure me when wearing everything I would normally carry in my day pack and my big winter down parka too. Just to make sure I added enough fabric in the sides.
In my normal sleeping position she measured me at 1799mm girth, close enough to a full 72 inches or a full 150mm bigger around than the majority of Expedition sleeping bags on the market.
Very few sleeping bags are big enough for me to be comfortable in but my ski touring days are probable over now so rebuilding this old bag makes sense to me because our snow conditions make my down half bag less than optimum even tho it is warmer and lighter.
Pix of the disassembled bag in the next post
Some damage to the Lite-Loft insulation but fairly minor and probably caused by plastic ski boots. I'll be chasing some insulation soon if anybody has some scraps of APEX left over
So a while ago I started carrying a LW bag as well as my bivvy sack.
It's a great bag for an Op-Shop $8- but I have never been able to do up the zipper if I wear my usual winter spare layer, a Patagonia DAS in XL.
Yesterday I disassembled the bag to start the process of changing it into a centre zip arrangement and to make sure I got it right I got my beloved to measure me when wearing everything I would normally carry in my day pack and my big winter down parka too. Just to make sure I added enough fabric in the sides.
In my normal sleeping position she measured me at 1799mm girth, close enough to a full 72 inches or a full 150mm bigger around than the majority of Expedition sleeping bags on the market.
Very few sleeping bags are big enough for me to be comfortable in but my ski touring days are probable over now so rebuilding this old bag makes sense to me because our snow conditions make my down half bag less than optimum even tho it is warmer and lighter.
Pix of the disassembled bag in the next post
Some damage to the Lite-Loft insulation but fairly minor and probably caused by plastic ski boots. I'll be chasing some insulation soon if anybody has some scraps of APEX left over