|The original NASA worm patches had rounded edges and a "ribbed" stitching in the white area. This is an example from Guy Bluford's in-flight shirt: |
On the blue background/white NASA worm, I did some research and I think this is where they came from. The white lettering in this version is substantially larger than the standard NASA sleeve patch, and was seen on the blue flight suits up to roughly STS-8:
These do not have the rounded edges and a larger total size than the standard NASA period patch.
Not too long ago, one of the NASA suit techs/closeout crew members had some items in a Goldberg auction, which made me remember that back in the '80s, the white room guys had blue NASA worms on the back of their coveralls. Here is one of those patches from the auction:
This back patch appears to me to be the same stitching and color as the astronaut flight suit patch. I think what they did was took these larger patches, trimmed them down, and put an edging around them to apply to the flight suits.
There may have been some additional uncut patches offered in this auction or another recent one, if memory serves. Unfortunately, I was not able to locate any screen captures or still photos of the closeout crew showing these back patches, but they were quite common in those days.