I think that’s the point HD. Short jackets and low rise jeans don’t mix well imo.
Plus you’d probably get laughed at in the street here in Oz if you wore a tucked in T-shirt, it’s just not done but we do have are a very casual culture here.
There were people here who used to tuck in t-shirts and iron their jeans with a front seam. To me this is the look of a anal retentive scoutmaster or a serial killer. Or both.
Like ton, tucked in anything fills me with terror too.
All this is personal taste and age related, probably. I personally don't tuck in anything either - shirts, t-shirts, whatever. And I haven't for 40 plus years. I don't care what it looks like to some.
Personally a well fitting shirt untucked looks perfectly fine to me in almost any situation. And tucked in shirts can look awful too esp if the shirt is baggy or poorly cut and if the guy is substantially heavier than his fighting weight it just exaggerates the tummy issue.