I found this site, as they sell jackets and trousers- which I prefer (I don't work on cars etc so dont need boiler suit type) , it may therefore be possible to tailor a jacket/trouser combo to fit properley if it would suit your needs?
Yes there are female mechanical engineers/Techs, Weapons Techs, Air Engineering Techs and therefore ovies should be made in female sizes (then again the RNs idea of equality is designing something that fits no one properly :P )
Going by all the female crew members I've seen lumbering around HMNB Pompey they only need to make them... shall we say... 'broad in the beam'
[Queen Elizabeth 1]
...I thank you from the bottom of my heart.
[Redbeard Rum]
Haaaaah! You have a woman's bottom milady! I'll wager that juicy pink pair of peaches was never wedged 'twixt two splintered planks, to plug a leak and save a ship!