Warning: Spoiler! (Click to show)
I don't think the rainbow look is requisite for peacocking, Theo. If you were wearing one of your hats today, it certainly qualifies, IMO.
All the items are great, and I especially love that suit.
I agree with those arguing for black shoes with this look. Brown suede with that plaid is great too, of course, but if you're going for that a little more warmth is needed in the shirt/tie to compensate for it I think. Nitpicking, because I really like all the items!
newton, bernoulli, clapeyron we could get some serious engineering done in here...
Newton's place is now either Hackett or Pink I think. You could engineer some damage to your wallet, I suppose! :)
Continuing my light-coloured tie saga...
The top half looks good to me, but the other half do not.
The trousers are a mess, seems to be a high waisted donned at the hips, i.e., Astaireish. And the leg opening is flaring in an unflattering way. Also, in my opinion, suede oxfords do not belong to summery fits. I am okay with suede loafers in summer, but oxfords are a bridge too far.
edit: the suede issue is sartorial nitpick, but the trousers issue is really visible