Emily Shaw started selling the T-shirts, jumpers and bags in October, and all profits go to charity.
It comes after the 38-year-old's mother, Norma Shaw, had surgery and radiotherapy after being diagnosed with the disease last year.
Emily said: "This time last year my mum and dad had just told me and my sister that my mum had been diagnosed with breast cancer.
"Thankfully the treatment that she had was amazing and they diagnosed it quickly.
"She had surgery on New Year's Eve last year. She went to New Cross Hospital and she came out the same day.
"Her and my dad met on New Year's Eve and they've spent every one together so they got to spend it together last year, they've been married 50 years now.
"It's been a weird year for everyone but we were really excited for this year as we were going to start the year with my mum cancer free.
"I had a conversation with my sister and we said how we really needed to check ourselves, everyone needs to make sure everything is OK.
"Then a few months ago I was in the shower and I realised I hadn't checked myself and I thought why am I not doing it.
"It's like you've got a fear that you will find something, but every bit of research tells you if you find it quickly it's for the best.
"I wanted to do something to show my mum that I was still there and thinking about her and supporting her so I did some little doodles then started to promote the T-shirts.
"I've already sold 29, they're £19 each and all sustainably produced."