If your seams are ravelling then the 1/4" is not the issue. I have old wuilts that have 1/8" or less and they have been washed many times and never ravelled. So stop worrying about it. There are plenty of over seams and wuilting to hold it. If you toss a iece of fabric in the wash does it ravel 1/4". Probably not. S stop worrying.