Short video about this bralette:
 
https://youtu.be/2B9oEG2t_2s
 
This bralette is made for S-M size. B cup size.
Best suitable for bust measurements from 33.4 to 37.7 inch
Best suitable for bust measurements from 85 to 96 centimeters.
Easy to sew. I sew it with linen.
Made for stretchy lycra fabric.
This sewing pattern also is suitable for a swimsuit top, lingerie, or crop top type of blouse.
The Pattern is in PDF format. 
You will need to glue on some details together. 
Made for regular A4 format printer.

A really simple pattern is suitable for beginners.
It requires about 14 inches or 35 centimeters of the main fabric and 95in or 240cm elastic string.