I have a pair of Sitka Celsius bibs (fleece-insulated softshell), Mountain Mimicry, size medium. I'm 5'6", 150lb, and these are comfortably roomy for me.
I bought them lightly used several years ago and I have never used them.
I also have an unused set of Browning fleece-insulated softshell jacket and pants, Mountain Mimicry, size medium, unused.
If you happen to be interested, please let me know.
If not, no worries and good luck with your search.