To put your membership on hold, please go Account and choose the Manage Your Pair. This brings up options to edit this pair, but if you select Order Settings in the top right-hand corner, it will reveal more options: select End Membership and during the cancellation survey, choose "I have much Underwear". At this point, you'll now see an option to Pause For Three Months.
You can always update your membership info during that three month period (as well as retain your membership pricing on everything we make), but even good things can use a brief break sometimes.