I still don't understand why people needs underwear, tshirts and socks delivered on a schedule. Personally I buy these items maybe once a year or every other year because they just last.
Maybe they use them harder than you do. Maybe they own fewer pairs of socks so they rotate more often and wear out quickly. Maybe they are picker about the condition of their clothes than you are. Anyway the "manpacks" are on a 3-month schedule, so just divide your annual needs by 4 and sign up :)
