Today I completed my wearable muslin of blouse 113 in the July 2007 BWOF. Overall I'm pretty satisfied and I'm planning to make it again. The collar can be more or less ruffly depending on how long or short you keep the drawstring with the cordstops.
I deviated from the pattern by making only 4 belt loops instead of the suggested 12, I raised the placement of the belt loops, and I made the belt a bit wider.
When I make this again, I'll add about 2 inches to the length.