Garment: It is a short-sleeved t-shirt, possibly with a slightly oversized or relaxed fit, given the way the sleeves drape.
Main Design: The prominent feature is a large orange “alo” logo printed or embroidered on the upper back, encircled by an orange line. This logo is immediately recognizable as belonging to the Alo Yoga brand.
Color: The shirt itself is white.
Other Details: There appears to be a black brand or size tag visible near the hemline on the lower back right side of the shirt.
Setting: The person is standing indoors near a large window, with a blurred view of a city street or commercial area at night visible outside.
It is a piece of activewear or streetwear from the popular Alo Yoga brand.