This is an outfit set with leggings and a v neck tee.
The legging are by Lularoe, made in Indonesia with a soft 92% polyester and 8% spandex. They are "one size", and measure 14" across the waist when laid flat, with a 25" inseam.
The shirt is from Forever 21, and is made in Vietnam. It appears to be made of a polyester and spandex blend as well, although this can not be confirmed. It is a US women's size small, measuring 25" from the back of the neck to the hem, 16" across the bust from underarm to underarm, and 7" from the shoulder to the cuff of the cap sleeve.
These items both come in very good preowned condition and would be a great purchase for the summer season.