1. A DD is not as big as you think it is. Tap to play or pause GIF Tap to play or pause GIF FreemantleMedia Enterprises We know you think DDs = Pamela Anderson's boobs, but there are a whole load of other factors at play. So you might think you have perfectly average-sized boobs and end up buying a 32G. Just trust us: We know what we're doing. 2. We're surprisingly good at maths. View this photo on Instagram instagram.com Working out your cup size, back size, which cut you want, and how the colour will affect the fit is actually quite hard. So practising it all day means our mental arithmetic is 10/10. 3. Some of us use tape to measure you, and some of us can do it by eye. View this photo on Instagram instagram.com Both methods work; it just depends on the way we were taught. 4. Most customers get really intimidated by standing in front of a stranger in a bra. View this photo on Instagram instagram.com But there's no need! We're basically desensitised to boobs, so we'll barely give yours a second thought. 5. Whereas others will just whip their boobs out as soon as they get behind the changing-room door. Tap to play or pause GIF Tap to play or pause GIF Domino Records But you can actually keep it on. The way the bra sits on you tells us all we need to know. 6. When someone brings in a dress like this and expects to find the perfect bra, we die a little inside. View this photo on Instagram instagram.com Bringing in your dress is helpful, but we can't perform miracles. Sorry. 7. Every collection has at least one bra that doesn't seem to fit anyone. View this photo on Instagram instagram.com And we dread you picking it up and asking us to fit you with it all afternoon. 8. We know more bra facts than we'd like to admit. For example: Bras tend to last between six and nine months. View this photo on Instagram instagram.com But even professional bra fitters cling on to their old faves, so don't worry. 9. Handwashing them keeps them in better condition for longer. View this photo on Instagram instagram.com That's why we always advise you to do so at the till. 10. And most people wear their bra too loose, with their straps too low. View this post on If your bra is too tight, try going up a back size and down a cup size. For example, if a 32F fits on the cup but feels a bit tight, try a 34E. 11. No one seems to listen when we say you need to fit two fingers round the back of your bra. Tap to play or pause GIF Tap to play or pause GIF The Island Def Jam Music Group If it's any looser, it's basically just an expensive boob decoration. 12. And dark bras need to be even more loose, because their ink makes them feel tighter. View this photo on Instagram instagram.com Confusing, huh? 13. The strapless push-up plunge bra with attachable multi-way straps that is also super supportive does. Not. Exist. View this post on We're trained professionals, but we're not miracle workers. 14. If it's quiet on the shop floor, we'll take the opportunity to try on all the bras in the stock room. View this photo on Instagram instagram.com We have to pass the time somehow. 15. Which means there's at least one topless employee in the back at any given time, asking for opinions on whether they should buy the bra or not. Tap to play or pause GIF Tap to play or pause GIF Universal Pictures 16. Then we'll use our staff discount to spend all our money on pretty lingerie. View this photo on Instagram instagram.com There are some perks of the job. 17. At least once a week someone will come in and demand a refund because they lost or gained weight and their bra no longer fits. Tap to play or pause GIF Tap to play or pause GIF Freemantle Media This tests our game face to the extreme. 18. And sometimes people try to return pants. Tap to play or pause GIF Tap to play or pause GIF Fox I mean, really? 19. Even though we'd never advise you to, we'll risk the dreaded double boob by stuffing our Gs into an FF. Tap to play or pause GIF Tap to play or pause GIF Columbia If it's an old bra that we're fond of, we won't give up on it. 20. People who drop bras on the floor while we fit them are the literal worst. Tap to play or pause GIF Tap to play or pause GIF Worldwide Pants Just hand them to us or pop them on the changing-room hooks. Please. 21. Every single bra code is imprinted on our brain forever. Tap to play or pause GIF Tap to play or pause GIF Universal Pictures #AU15BL32GG 22. But actually, being a bra fitter is pretty great. View this photo on Instagram instagram.com We give confidence to people with body issues, support women who've had mastectomies, and make everyone look great. What's not to love?!