"From the radian of each petal to the arrangement of the color of the flower's center to assembling the whole flower, each detail has to be painstakingly performed to make the flower perfect," the 33-year-old says.

Shi makes demonstration videos of how to make the flower and has live Q&A sessions. Clients also get a bag of material with necessary accessories.

Each of the studio's onsite classes has around 15 students, and the wedding-gown course is among the favorites.

It teaches about their structures and how to do the measurements. It also shows students how to transform 2D designs into 3D dresses using sewing machines.

"A customized wedding dress requires dozens of measurements," Shi says.

Jiaran Studio staffer Wang Yiran says nearly every wedding-dress class participant completes her gown, including brides-to-be.

"Some students own wedding-dress stores. They start their own customized-gown businesses after taking the course," Wang says.

"Some later start their own studios."