Yeah layers. My girlfriend keeps buying me mostly mid-weight fleece garments at thrift stores.....and I take several, depending on climate in addition to a very light "soft-shell" and/or a rain parka.

If it's much below freezing I usually take fleece pants also, in addition to mid-or light-weight long underpants.

I always take a light-weight wind-shirt. The one I have cost about ninety dollars.