The Earth travels around the Sun in a semi circular orbit. The Sun is moving toward the Galaxy of Andromeda. Therefore we are moving in a spiral.
The clothing loss effect of time travel is a continuing study by the Academy of Un-Natural sciences. You lose clothing traveling both forwards and backward in time. Whether you lose clothing from the top of you body, or the bottom depends on if you are on the forward or tail end of the spiral we are traveling in.
It’s the same effect that makes your socks disappear from one of those fancy new electric clothing dryers. The combination of movements just makes your clothes disappear.
One of our researchers has found a possible connection with non-tachyon cosmic radiation interference with non-monofilament fibers. After all, we have clear evidence that silk undergarments aren’t affected to the same degree.
We have purchased a variety of silk undergarments for our research subjects and will be conducting more experiments within the academy grounds in Antarctica to study these effects further, and design more flattering undergarments.