My all time favourite trick to get that ultra oversized look is to borrow some men clothing! Or better- to buy it. You have many styles that looks awesome as oversized piece on a woman body. I have so many men pieces in my closet simply because it is more budget friendly to check their racks than to search for women oversized clothing- in many cases if it is labeled “oversize” it also means more expensive. But totally not worth it in my opinion. And another benefit- men clothing is usually made from stronger, more compact material and it looks better in real life and in photos.