My feet got freezing during my labours, second time I packed a fluffy pair of bed socks and I was soooo glad even though it was July. The rest of your body gets hot but I suppose your feet are a low priority for blood flow! Also wore a short nightie, not just socks! took leggings and baggy top to change into after, found leggings helped keep my maternity pads in place (so dignified) and supported my belly a bit.