Big name suits are toss imo.
it can be the "nicest" suit in the world, but if it doenst fit it will look like a sack.
if your "the national average" in shape, then fine, but imo you are much better off going to, say M&S, or other similar, buying a suit as close to your body shape as you can, but sized up rather than sized down, and then getting them to adjust it for you.
there SHOULD be someone on the staff who knows what they are talking about.
ive had a few suits for one reason or another, but my favorite came from M&S and was ~150 quid including adjustments.
pretty basic suit, but because im tall and lanky, it looks the mutts (imo) purely because it fits!