Half an inch in waist shrinkage will get me to just about what I bought my 555s at.
. Note of caution… I hot soaked,washed and put them into a hot drier,and I don’t feel as if I got any shrinkage. Feels as if the waist might have stretched since I’ve been wearing them.
Stretch or no stretch that 38.1 is pretty much what my 555-01od measure out to after some wear.