For you engineering types: Sublimation or evaporation?

If you were to hang wet clothes outside on a cold winter day, would the drying process be due to the liquid water in the clothes turning to vapour (evaporation), or turning to ice and then vapour(sublimation)?

My initial thought was sublimation due to the direction of heat transfer from the warmer temperature shirt to the colder atmosphere, as opposed to drying on a summer day where the heat is transferred from the warmer atmosphere to the colder shirt. If this isn’t the case, can anyone explain it otherwise? I have a feeling vapour pressures and/or latent heats have a big part to do with it.

I’m not sure if I understand the question completely, but if I do - it depends on many factors, like the temperature and amount of water. Initially the water on the wet clothes are above freezing so they evaporate. If the temperature of the air is below freezing, and if the clothes are wet enough, the water will freeze before it all evaporates. After that it can only dry through sublimation. Sublimation is a very slow process though, so if it comes to that I think you’ll be left with frozen clothes, not clothes that dried through sublimation.