| Toblini, Fabio | Fabio Toblini | Costume Designer | 2012 | 1 | 1 |
| Teti, Carla | Carla Teti | Costume Designer | 2013 | 7 | |
| Tran, Jessica | Jessica Tran | Costume Designer | 2013 | 1 | |
| Turner, Stella | Stella Turner | Costume Designer | 1958 | 1 | |
| Trutko, Helen | Helen Trutko | Costume Designer | 1951 | 1 | |
| Travis, Leonor | Leonor Travis | Costume Designer | 1951 | 1 | |
| ten Berge, Hadewych | Hadewych ten Berge | Costume Designer | 1999 | 1 | |
| Tandberg, Gerilyn | Gerilyn Tandberg | Costume Designer | 1999 | 1 | |
| Takase, Kurumi | Kurumi Takase | Costume Designer | 1999 | 1 | |
| Tostado, Casa | Casa Tostado | Costume Designer | 1944 | 1 | |
| Tierney, Patricia | Patricia Tierney | Costume Designer | 1947 | 1 | |
| Teglers, Ole | Ole Teglers | Costume Designer | 1948 | 1 | |
| Tam, Mandy | Mandy Tam | Costume Designer | 2014 | 1 | |
| Tărășescu Jianu, Eugenia | Eugenia Tărășescu Jianu | Costume Designer | 2013 | 1 | |
| Tschetter, Jane | Jane Tschetter | Costume Designer | 1978 | 1 | |
| Tilley, Martin | Martin Tilley | Costume Designer | 1981 | 1 | |
| Türkoğlu, Nalan | Nalan Türkoğlu (Nalan Turkoglu) | Costume Designer | 1987 | 1 | |
| Tait, Nikki | Nikki Tait | Costume Designer | 1984 | 1 | |
| Turcanu, A. | A. Turcanu | Costume Designer | 1964 | 2 | |
| Tosa, Yoshi | Yoshi Tosa | Costume Designer | 1976 | 1 | |
| Tasdighi, Manijeh | Manijeh Tasdighi | Costume Designer | 2018 | 1 | |
| Taran, Sabine | Sabine Taran | Costume Designer | 2018 - 2019 | 8 | |
| Téroitin, Patrick | Patrick Téroitin | Costume Designer | 1994 | 4 | |
| Trikerioti, Mayou | Mayou Trikerioti | Costume Designer | 2022 | 4 | |
| Toobe, Federico | Federico Toobe | Costume Designer | 2023 | 1 | |
| Tihanyi, Ildikó | Ildikó Tihanyi | Costume Designer | 2022 | 1 | |
| Toser, David | David Toser | Costume Designer | 2019 | 1 | |
| Taddei, Andrea | Andrea Taddei | Costume Designer, Designer | 2000 - 2014 | 21 | |
| Titze, Sebastian | Sebastian Titze | Costume Designer, Designer | 1975 - 1995 | 4 | |
| Tolo, Kathrine | Kathrine Tolo | Costume Designer, Designer | 1998 - 2010 | 27 | 1 |
| Trienekens, Elvira | Elvira Trienekens | Costume Designer, Designer | 1997 | 2 | |
| Tautz, Franz | Franz Tautz | Costume Designer, Designer | 1961 | 2 | |
| Träbig, Ilse | Ilse Träbig | Costume Designer, Designer | 1975 | 2 | |
| Tsao, Calvin | Calvin Tsao | Costume Designer, Designer | 1973 | 2 | |
| Thormann, Hans-Ulrich | Hans-Ulrich Thormann | Costume Designer, Designer | 1979 | 2 | |
| Ter-Arutunian, Rouben | Rouben Ter-Arutunian | Costume Designer, Designer | 1976 | 2 | |
| Thomasberger, Erika | Erika Thomasberger | Costume Designer, Designer | 1953 - 1962 | 5 | 1 |
| Tschunko, Maxi | Maxi Tschunko | Costume Designer, Designer | 1959 - 1967 | 6 | |
| Thaler, Susanne | Susanne Thaler | Costume Designer, Designer | 1984 - 2011 | 13 | 1 |
| Thorbjørnsen, Bård, Lie | Bård Lie Thorbjørnsen | Costume Designer, Designer | 2010 - 2017 | 100 | 1 |
| Taravella, Luisa | Luisa Taravella | Costume Designer, Designer | 1988 - 1989 | 18 | |
| Tienhooven, Theo | Theo Tienhooven | Costume Designer, Designer | 1991 - 2009 | 90 | |
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