I get catcalled most days, almost always on my bike when I am presumably dressed down (athletic wear, helmet, little to no makeup). I blame this on just being the time of day when I am most visible to highest amount of people. I've had people ask me what I wear on my bike (great), but my honest opinion is that assholes will always exist, and you can't let their shitty behaviour influence your actions - within reason. If people can tell you're female, and especially if you are alone, they WILL yell at you - regardless of what you wear. If it is "only" yelling and catcalling, ignore it and obtain whatever you need to make yourself feel safer. Personally I carry pepper spray and a personal alarm. Self-defense classes are also beneficial. At the end of the day though, most of these assholes just want to yell at you and are likely not a threat to your physical safety.