PDF Crochet pattern for the "Bff top". It features a tight fit, low back and a knit look and gives you 2 length options (bralette and cropped). I'd say this pattern is for confident intermediate crocheter and up. Pattern is in English by default, but available in Swedish upon request. 

Sizes
To fit chest
75 (85) 95 (105) 115 (125) 135 (145) 155 cm
 
Chest measurement of finished garment
60 (68) 78 (88) 98 (108) 120 (128) 140 cm
 
To be crocheted with 15-20 cm of negative ease, it’s supposed to be skin tight and stretch to fit your body. For reference, my size 85 stretches to a full with of 88 cm.
 
Length of finished garment, measured from the top hemline to the bottom hemline of the front.
Bralette length
21 (22) 24 (27) 29 (31) 32 (35) 36 cm
 
Cropped length
31 (32) 34 (37) 39 (41) 42 (45) 46 cm
 
I am 176cm tall, with a chest measurement of 82cm and I am wearing size 85 in the bralette length.
 
Materials
Yarn
Lang Yarns ”Norma” (50g/135m) col 160
Bralette length
100 (100) 100 (100) 150 (150) 150 (150) 200 g
Cropped length
150 (150) 150 (150) 200 (200) 200 (200) 250 g
 
Crochet hook: 3,5 mm
Other: Tapestry needle.
 
Gauge 10x10cm: 24 sts by 23 rows in yarn over slip stitch in the back loop only, on hook 3,5 mm or hook needed to meet gauge.  
 
Techniques
Slip stitch - insert hook in the advised loop, pull yarn through all loops on hook.
Yarn over slip stitch- yarn over, insert hook in advised loop, yarn over and pull through all loops on hook.
 
The top is crocheted in two panels, front and back, that are sewn together at the sides. Both panels are worked side to side, in a combination of slip stitches and yarn over slip stitches. The front has integrated straps on both sides.