Good luck, Freddy, if you go - whatever you wear.
I'm not a Philistine, nor unduly tight-fisted (unless you ask my wife!) but I am totally unwilling to go to any sort of live performance (theatre, ballet, opera, concert, stage show or whatever) that costs more than, say, £20 for the seat - and not even then if the cost of travel etc is significant. I simply don't enjoy something of that sort enough to justify making a big dent in my pocket - as with luxury hotels or holidays and the like. More to the point, on the last few occasions I have been tempted by (or treated to) such an event, the aggravation of getting to the venue, being ripped off for any extras and finding a poor seat/view and mediocre performance has made the whole event less than worthwhile - I would have been better-off (in all senses) to watch it on the TV! That said, I do enjoy live theatre at one or two of the small provincial places which are easy to access and have a sensible price structure. And, if going alone, I am likely to emulate you and Shyheels and dress to suit my mood without making a fool of myself.