Personally, I can't find any correlation between the clothes and good tandas so far. But even where I see a correlation, like height and shape, there are some exceptions. So it doesn't seem particularly wise to me to restrict yourself by rules.
On the one hand, I agree with the basic idea that clothing doesn't matter. As I wrote, once I'm
certain that the person I want to invite follows, I don't care how she's dressed. However, there's a hidden assumption in my statement: If I've watched a person dance, it inevitably means that I've learned not merely whether she follows, but also
how well she follows and whether she does so in a fashion that suits my style of dance.
On the other hand, clothing can serve as a useful shorthand when you have only a few seconds to invite someone to dance. As I
also wrote, traditional follower garb, particularly high heels, signals "I am a woman who dances in the follower role." However, that can backfire badly . . . In particular, a huge number of not-so-great-but-persistent dancers smokescreen their lack of ability with expensive outfits.
To be clear: I don't think this is specific to leaders observing followers! Followers should watch how leaders dance before accepting invitations from them, and definitely shouldn't take polished shoes and a sharp suit as a sign of anything but having the money and time to dress up. In a follower-heavy environment, many exceptional leaders are in such constant demand that they dance nonstop and end up with scuffed shoes, dusty trousers (from all those pasadas . . .), and a disheveled look.
In the balance, it seems that ignoring outfits is probably smartest. Better to watch how someone dances.