Imagine your VTuber avatar walking through a winter wonderland. The "Full" rig allows for smooth arm lifts (important for reaching for a mug or gaming) without clipping through the aurora cape.
Based on available information, there is no official consumer product, movie, or widely recognized media project titled "polarlights nikole set 73 98 full."
The dynamic shaders of the Nikole 98 update are a dream for in-world photographers. Set your scene in a snowy tundra or a frozen castle, and the dress acts as a secondary light source.