[Krysanthemum]

Wife was away for a few hours today, and I just couldn't resist squeezing myself into one of her tops and bras. 
It's way too tight but I really like the support, I'd wear a bra full time if I could..

You know, I think you're at a point where you genuinely could talk to your wife about wanting to try a sports bra or something and she'd understand.  I think most women, upon seeing your chest, would agree that you could use the support.  After all bras aren't really for women - they're for breasts!

A lot of women in general are really not that bothered by men in bras, especially when the bra is an actual functional garment for them.  I don't know how your wife would feel about the crossdressing or anything else, but I've even seen some pretty conservative women audibly comment on how some men ought to be wearing bras too.  

Mine knows I've been crossdressing for a long time, and the dynamic we have around it and gender stuff in general is complicated.  But she was never really bothered by me wearing bras, especially knowing that the support makes me more comfortable.  That was basically all she needed to hear, and she basically endorsed it from there.  And I don't have half of the volume that you do!