So far so good! Was just about to go out and get some color catchers as part of the tests
The overcasting is a good idea but one I usually skip. For this wash test, I am basically cutting fat quarters and washing one (plus the rest of the fabric) piece and leaving the other fat quarter as it came to do a comparison.
What I took for selvedges is just the end of the print run and go width-wise and not down the edge. Selvedges are thin and narrow, print goes all the way to the edge. Even without them/trimmed off the fabric is a good 44" wide.