Black in summer
So all black in summer totally managable if you'd ask me! If it gets really hot it's smart to think about what kind of fabrics you wear though. Cotton, linnen, fabric with little patrons so the wind passes through that kind of items. Another thing people easily forget in summer is the shape of a top. For example this blouse had tiny holes in it, but still the fabric can get pretty hot. This is no problem here cause the blouse is losely shaped. A tight top in summer is almost a guarantee for sweat stains!
Going All black but not boring
Not all people like to wear all black anyways thinking it gets too boring or too gothic. A way to make sure an all black look stays interesting is to wear differt fabrics! In this case the lace from the shorts and little dot print from the blouse. But you've got so many different fabrics to combine: Leather, suede, wool, acryl, cotton etc. or just a print!
Another tip is black is black, but you do have see through or just plain black. If you add a see through piece every look feels just a little less dark. Or you can opt for a piece with holes in it.
Lipstick: Kylie cosmetics "Dolce K"