Is it possible to farm for the cosmetic drops indefinitely or is it a once per day chance?
Depends which chest the cosmetics drop from. If they drop from a bountiful chest (which I assume they do but I could be wrong), then you are capped at 4 attempts per day (assuming you have the necessary keys).
I’ve seen confirmations on Wowhead comments that people have gotten them from non-bountiful Delves.
Well then in that case, you should be good to spam them infinitely.
Do we know if they have a higher chance at dropping off higher tiers? I saw they can drop from T1 Delves but idk if that person just got lucky or what.
I’ve no idea. Honestly, I don’t think I’ve managed to get a single cosmetic in any of my delve runs other than actual gear.
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Depends on what chest the item comes from. Some items come from heavy trunks some items come from bountiful chests
-Heavy Trunks can be farmed infinitely, you just need to finish the delve, and there is always 2 per delve
-Bountiful chests can only be opened if you complete the delve with lives remaining, and only 4 delves are bountiful each day, so you only get 4 a day.
-Delver’s Bounty chests are RNG gated, you need a delvers bounty map to drop then use it to make the next delve you do have an extra chest.
The cosmetic helms can be purchased or drop from any delves of any level it seems.
You can loot the mushroom helm out of a nerubian delve like earthcrawl or spiral weave
Specifically, I’m after the Trailblazer’s Haversack.
For what it’s worth, I’ve done almost 120 Delves at this point (the vast majority of those Bountiful), and the only “cosmetics” I’ve gotten have been appearances from actual loot drops.
So either I’m the unluckiest person on the face of the planet, or you have to buy the rest off the Vendors in Brann’s little HQ for Undercoins and/or Resonance Crystals.
you can spam them. I love doing delves and have been doing them for a while.
Wanna do Nightfall together? (Can you trade cosmetics if they drop for someone else?) 
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In my experience they’re decently rare even in bountiful.
Many of the cosmetics that drop are not sold by the vendor in Dorn. Pretty sure the pets that drop can only be obtained from the delves themselves.