You know what? I'd try that tunic over your slouchy silk pants! Great volume-on-volume pairing, just add a belt to the pants to accentuate the waist (I think it may well peek out given the cut of the shirt). AND you could layer it over a dress as a sort of lightweight poncho in fall. Until then, wear with clams? Would also be fab with the new boyfriend shorts and a statement pendant I think.
I wear white in winter --- lots of people do around here. Summers are hot and humid, hence messy for whites --- you need 'privilege' to wear a lot of white in summer, or willingness/budget to get refresh your whites every season or every other season (that used to be the norm for the sheer embroidered shirts we all wore in summer, growing up; wonder how many still do that). Pricier whites --- like wool and silk --- are typically reserved for the cool (so not as sweaty) and dry (so streets not as messy) winters, and it actually looks spare and serene, as winter should in my head; don't see why the same shouldn't apply to leather.