Exactly this.
And I'm fine with that. I'm sure the short shorts will still show up here and there in other products and stories, but main continuity isn't going to be hurt by that outfit not returning in its purely original aesthetic.
That said I don't want or need a bunch of excess on the costume either; you start adding in crap and you're left with a generic design that could belong to anyone. So I'd rather Dick's Robin suit just have some proper pants and boots, and leave all the rest largely as-is. But some pants aren't a problem, and I'm sure young Grayson will appreciate it during those cold Gotham nights.