Worth considering whether your clothes were snug before and now just fit comfortably.
Also possible they're getting genuinely oversized but still feel okay simply because nothing's falling off you outright. Trying on a smaller size might actually surprise you with a better fit than what you've currently got on. Definitely been there myself. I actually do this on purpose now since I've dropped several sizes and don't want to overhaul my whole closet every single time I size down. Right now, for instance, I've got jeans on that technically 'fit,' US size 14, but they're genuinely too big. I've got another pair two sizes smaller that actually fit way better. I like keeping a handful of pieces that fit properly, alongside a few that run slightly big but are still wearable.