Each sport has their specific functional attire, designed depending on the needs of the particular sport. I can’t understand why anybody would think that it looks ‘unprofessional’ to wear the appropriate attire for the sport you’re doing. I have never heard anybody argue that a swimmer looks insufficiently professional because he wears briefs or that a beach volleyball player looks insufficiently professional because she wears a bikini. (The controversy about the maximum coverage rules for female beach volleyball players is a different issue.) So why would anybody think that triathletes wearing a tri-suit don’t look sufficiently ‘professional’?
‘The wind doesn’t like skin’, is a good rule of thumb, but it isn’t without exceptions. And apparently, Sara Pérez Sala is one of these exceptions.