GWaS, in that case I retract the advice I gave in that other thread. Dress up for the flight test itself but I wouldn't bother for training. Make sure you wear the shoes a few times though, so you get used to how they feel.
Edit: I'm guessing the other thread was locked due to the suggestive comments. Unfortunate but not surprising. Sometimes you have to know your audience and that isn't possible on a public forum. A sign of the times.