These seem to be very large versus the sizing.  I have worn FOTL boxer briefs for the past 2 or 3 years and the small size has been fine.  If anything they have shrunk a little with repeated washings.  I was a little surprised that this latest set - also size small - are so relatively loose.  I have washed them once and I think this helps but I don't think of myself as being too small for a small - eek.  I have a 31 inch waist and haven't changed all that much for 30 years.  Hopefully the briefs will shrink as they look well made are and my older pairs have held up well.