I remember standing in a changing room cubicle holding up a pair of mid blue jeans against a plain white t-shirt and white trainers, thinking they looked oddly boring on the hanger, then putting them on and realising that was exactly the point. Nothing else needed to try hard once they were on.
Getting the fit right starts with checking what the denim is actually made of, not just the wash. A cotton with a bit of elastane in it will give you some stretch and recover its shape by the end of the day, while a stiffer, heavier cotton holds its line but needs a proper break in period, usually a few wears before it stops feeling like cardboard at the knee. Try sitting down in the cubicle, not just standing in front of the mirror, because that's where a waistband that gapes at the back reveals itself, and do a full squat if you can bear the look on your face while you do it, since that's when a too tight rise digs in and a too loose one gapes open at the back belt loops. Watch the length too, mid blue denim shows every fade line, so a pair that's been turned up and let down more than once will have a pale crease across the hem that never quite goes away.
For everyday wearing, mid blue sits in that useful middle ground where it doesn't read as formal or as scruffy, so it goes under a blazer for something that needs a bit more polish, or under a jumper with trainers for anything that doesn't. A plain knit, a white shirt, a leather jacket if you have one, all of them look like they were chosen on purpose rather than grabbed in a hurry, which is the real trick of this colour. It also does the job of making a top look more considered than it is, because mid blue doesn't compete with anything.
On shade, a wash with a slightly faded, worn in look is more forgiving day to day than one that's crisp and dark, because it hides the small creasing that happens behind the knee and at the hip without looking tired. A finish with too much shine or too obvious a whisker fade tends to date faster than a straightforward, honest fade.
Would I still want these in a year, or only until the next wash changes the colour.