I probably seem like a hater (I'm honestly not) and I only comment because I care / sold you some ties so feel responsible for your steez soul...
I don't think that's a sportcoat shirt.
I don't love it but - especially here in London - it's a thing. You see a lot of people rocking a navy, charcoal or even electric pinstripe suit with shirts like that. I just think the pattern is too bold for an odd jacket, unless maybe a navy blazer.
Even if the scale were smaller, that much white and paired only with a bold, brightish blue seems to call for a suit much more than a brown SC.