Britany (Hargis) Costello was a four-year letter winner for the Lions and ranks as one of the best pitchers to wear the Green and Gold. A four-time All-MIAA honoree, Hargis was a first-team selection as a freshman as she was named the MIAA Freshman of the Year en route to an All-Region selection that year, as well. Hargis went on to earn honorable mention All-MIAA as a sophomore and a junior, before earning first-team honors as a senior and being named the MIAA Pitcher of the Year. That season, Hargis went 18-4 in the circle with a 0.89 ERA, ten saves, 167 strikeouts and held batters to a .187 average in 149 innings pitched.

Hargis has her name all over the record books in MSSU history. She has the MSSU single-season record for saves with ten in 2001, while also posting the second and fourth-best single-season strikeout totals in school history. Her 39 appearances in 2001 is fifth-most in a single-season, while her 26 complete games in 1998 as a freshman is seventh-most. Her 12 shutouts in 1998 are third-most, as well.

Hargis is the MSSU career-leader in strikeouts (482) and saves (15), while ranking second in strikeouts per seven innings (6.49), fourth in both appearances (105), complete games (58) and shutouts (25), while ranking fifth in starts (70). She helped the Lions to 150 wins over her four-year career, earning 54 wins over those years, ranking 4th in that category.

A native of Broken Arrow, Okla., Hargis graduated from Southern in 2013 with a degree in general business and has been serving most recently as a special education teacher and softball coach in the Coweta (Okla.) school district. Hargis and her husband, Sean, have two daughters, Carson and Addie.