Aww she's sooooooo cuuuuuuuuuuuute XD
J is pretty good at guessing my size but unfortunately I don't like wearing the stuff he would like to see me in XD
I told him I was writing this comment and he made a massive show of a massive pout XD
Middle is also pretty good at sizing, she has bought clothes as presents blind and never had a problem (which understandable when looking but somehow she manages online as well).
there was an amusing situation recently where we were wearing our team colours for work and middle said I could borrow one of her shirts which was the correct colour for one of my groups and I said that it would be too tight and she said no we're the same size you just like wearing big shirts. Dubiously I tried her shirt on and lo and behold we're the same size I just like wearing big shirts (her shirt fit me perfectly and because of the tactile issues my skin has most of the time this is fine but other times it's "too tight" even when it's not even tight)