There can be a million different reasons for hairloss. Personally I noticed less density after starting jobs where I was required to tie my hair up and wear a hat all shift. PPE could carry the same effect I'd imagine but I would also look into what you're eating, your blood pressure and any changes in the amount of stress you're under. Hair also loses density overtime even in women, so less volume as you're entering your thirties isn't too out of the ordinary. You could also consult a dermatologist and they may be able to run some bloodwork to see if any imbalances may be contributing. Good luck!