I know plenty of people who are not c-level who easily spend $69+ on shirts. In fact, I would argue that most people on wall street are expected to pay $50+ on shirts. $250+ would be c-level IMHO.
Data point - Brooks Brothers does $750MM in revenue[1]
That is a true statement, about Wall St. Less true about C-level, until you hit pretty big companies. A typical C-level or VP-level earns between $200k and $500k, typically towards the lower-end of that (obviously, Fortune 500 would be millions for CEO -- I'm basing this on companies of ~100 employees).
I don't know typical Wall St. income, but the friends I have there are around $300k. You can cite Google and Apple employees too as spending $50+ on clothing. That's all the elite.
Median household income is $51k in the US. That's 1/3-1/6 of a single salary at Google (and most have working spouses as well). It's perhaps 1/6 of Wall St. That translates into many times that difference in disposable income.
I appreciate the appeal of making products for people similar to yourself, but if you think that makes for a good business plan, compare you $750MM in revenue to TJ Max with $18B in revenue, Gap at $13B, Ross at $10B, etc. If you look at relative prices, that's probably about 100x as many items of clothing sold.
Data point - Brooks Brothers does $750MM in revenue[1]
[1]- http://www.insideview.com/directory/brooks-brothers-inc