Oh wow. Way too much, probably.
I have an OSU fleece jacket that I wear as a winter coat every day from ~October to ~April.
I have a "Won it First" poofball hat that I wear if it is colder than 35 degrees (I don't care if it is unprofessional).
I have a red OSU logo golf shirt that I wear every Friday during football season, and in past years I would wear it on Basketball game days, although I've admittedly paid less attention to Basketball since my son was born, so I haven't lately.
I have about 4 or 5 different OSU hoodies, I get one every 2-3 years and since they are good quality and generally last long. So during the Spring and Fall, they are my go-to for every-day non-work attire.
I have a subdued block 'O' hat (similar to the Brutus hat but black and not grey) that I wear during the Summer, as well as 3-5 t-shirts that I rotate. I also have block 'O' socks that I wear on football game days, and a pair of OSU running shorts.
I could probably come up with more, but that's all I can think of at the moment. So on any given day, I could potentially have 1 to 5 different pieces of OSU gear on at a time, and rarely do I go a day without wearing any.