Rosi was born and raised in Switzerland. After her 3 year apprenticeship as a dressmaker (Swiss Diploma) and five years of running her own fashion and costume studio (Best Of Rosi), she enrolled at the School of Art and Design in Basel, Switzerland, where she graduated with a BFA in fashion design. Later she attended Central Saint Martin's School Of Art and Design in London where she studied fashion illustration (Certified).

In 1996 Rosi immigrated to Los Angeles and soon landed work in the entertainment industry. Within a couple of years, she was accepted into the Costume Designers Guild as a costume illustrator, and into the Motion Picture Costumers Union as pattern maker/fitter.

Rosi currently teaches at OTIS College of Art and Design, Los Angeles (Visual Communication1+2 and a Special Topics Prop Design elective in Product Design, and she used to teach Fashion Model Drawing in the Otis Fashion Program for 17 years). Rosi also teaches Costume and Fashion Drawing at Art Center College of Design in Pasadena.

From 1999 to 2003, she worked on the television series Sabrina, the Teenage Witch as head pattern maker/fitter. She also created all of the costume illustrations needed for the show. In addition to her television and film work, Rosi creates and produces her own collection, Best Of Rosi.
Rosi's credits as a costume illustrator (film, TV) include:

Capital One Commercial (2019 - Cirque)

Death Wish (2017)

Jerseyboys (2014)
Moneyball (2010)
XXX State Of The Union (2004)
Don't Stop The Carnival - theatre (2003)
L'Oreal (several commercials 2000-2004)
The Janet Jackson Tour (2001)
Ghosts of Mars (2000)
Mission to Mars (1999)
Star Trek: Insurrection (1998)

Rosi’s credits as a pattern maker/fitter (film, TV) include:

The Morning Show (2020)

9-1-1 (2020)
XXX State Of The Union (2004)
Fly By (Superman)
Pluto Nash
Contact
HBO's From The Earth To The Moon
Bicentennial Man

Her work has also been featured at various fashion shows and charity benefits including the DIFFA's AIDS Benefit Runway Show, held at the Pacific Design Center in Los Angeles.

Please visit Rosi's personal website: www.rosigabl.com