OK, I was going to tell you not to fret about it, that it's not Haute Couture Dahling, so don't expect to be the only one you know to buy it... but I've just seen the jacket, and saw that you only bought it this morning....
TAKE IT BACK!
TBH, It's so OTT and obvious, and at £70 for the amount of wear that you will need it to have, i.e he'll have to LIVE in it for the cost per wear to be anywhere near reasonable.... and looking at it as a jacket, it's not like it's ever going to be overly useful...
If money is not that flush, £70 can buy at least a couple of entire outfits somewhere like H&M FGS! They have some ADORABLE tealy blue leatherlike jackets, for £20, and with a good shirt or a polo or something any DC will be drop dead gorgeous, but STILL have a really good 'best' jacket that doesn't look like a piece from the dressing up box.
If you really feel like scoring points back, say you thought about it, realised that at £70 it was a little tacky (it is, unless you have money to BURN!) and reconsidered.
That way IF she does what you think she is going to do, i.e a photo shoot, then you've done that in for her already, potentially making her look the LOON for spending such an exorbitant amount of money on a supposedly high-fashion item that will be out of vogue before the few months it'll take for your DC to grow out of it.
Oh and learn for the next time, next time you buy anything of importance, don't FGS tell anyone about it. I can't BEAR being copied either, and to do it so blatently would have my blood literally boiling.
Go on, take it back, you know it make sense!!