The dress-wearer here. Getting into the dress with all the electronics was a bit daunting, just because I didn't want to pull any of the wires, but it was totally comfortable to wear. I was able to sit (which I was worried about) and dance totally normally. The dress did have extra room in the top, so the battery pack and flora were able to be installed there. This dress was also perfect for installing electronics because it had two layers on the bottom, so I was able to have the LEDs in between in top layer and bottom, so they weren't touching me.

Yeah, she couldn't tell at all. I used 30 AWG gauge wire, which is about as thin as thread, but is actually sheathed in a protective coat so that it doesn't short when it touches other wires.

Which was a good thing since there are 3 wires per strand (ground, data, and power), for a total of 18 wires connecting to a single Flora module. I also measured everything out a few times to make sure it wouldn't pinch or stretch uncomfortably.

The battery pack was mounted with elastic fabric to a part of the dress where there's a bit of slack (right above the stomach).