Masculine clothes ideas?

So I'm afab genderfluid, but I've never really been 'girly', no dresses or skirts (except on very rare occasions). So the majority of my closet is cargo pants, plain t-shirts and hoodies, it's what I've worn constantly basically since I was a child.

So now I've realised my genderfluidness I have an issue, people don't notice when I'm having 'boy days' because I look the same (on 'girl days' I'll wear more 'girlish' things)

So, any ideas?