The base is a gathered collared blouse and gentleman's pants. I tied a vintage Adidas track jacket around my waist. Although I only used a few items, I added movement by wearing it asymmetrically.
I think the way you wear a gathered collared blouse is important to avoid looking too sweet. Rolling up your sleeves and showing your décolletage will give it a neater look and reduce the sweetness. Leaving all the buttons unfastened is also a key to creating a neat look.