My elderly mum has asked me to knit a jumper for her, when I asked her a chest size she said 38 but with a bra extender added BUT she has to wear size 20+ clothes as she has a big tummy. She has slim shoulders though and is only 5ft 2". She lives away and can't measure herself due to a lack of shoulder flexibility. Can anyone give me an idea of what chest size you might be if you have similar dimensions? My knitting pattern only goes in chest size and I'm concerned if I size up too much the jumper will swamp her, will of course amend the pattern for arm length. Thank you.