Will Robinson Tunic Season 1 & 2

This picture shows Will wearing the longer tunic as he grew taller by the end of Season 2, in the Lost in Space episode The Astral Traveler. Note, looking at the different variations of this costume that the early ones are shorter and the yellow shows most of thw way down the front zip. In the later, longer tunic, the yellow stops at the bottom of the v-neck.