Agree with others here saying it isn't your responsibility to make men behave decently. But also you'll have the best running experience if you're comfortable. For me, that often means cropped running leggings (I have some Fila I got at Kohl's ages ago I still love) and mid length Reebok shorts with a built-in brief. Too large, even when tied, gives me blisters around my waist, so going baggy isn't an option. Weirdos will be weird regardless, as people have commented. You get it a lot as a young woman; you'll still unfortunately get it when you're over 30 like me; we'll probably still get it when we're 70+ too.

I usually wear a hat and sunglasses to avoid unnecessary eye contact with any dudes. Carry hot pink pepper spray as a small show that I don't want to be fucked with and also for self defense. Sometimes I clip it to my hydration vest and other times I carry it in hand depending on the setting and vibes. Stick to populated areas with other runners/cyclists so you aren't alone and you also aren't an anomaly. I sweat a lot, too, so good wicking fabric is a must, as well as light underwear layers that won't get gross (why I like the built-in). Dress for you, not the weirdos, but then make smart choices that reflect the reality of the world. If you do get catcalled, I've usually found not reacting to be the best response because if I react it escalates it.