Mirch, dont you have executive meetings with the top brass where you might have to wear them? Come on, just buy it, you have to make your BIL happy, its his day for crying out loud! Need some pointers?
I do have those meeting but it is all business casual here. I am IT guy so they do not mind even if they are wearing suits and I am not. My CIO wears jeans even to those meetings. So I take my cue from him. :).