I found these New Balance 327 sneakers back in stock in this exact color at 2 retailers! I personally go down half a size in this style.
My exact scalloped skort is 90 Degrees by Reflex from TJ Maxx but it's sold out online. I linked to a similar one.
I have the older version of the J.Crew jacket in size XXS (I cuffed the sleeves once).
Athleisure outfit idea