In 1942 US troops farmed 7,000 acres in England, 14,000 in 1943. The USAAF in England sourced 49% of its supplies from British sources until July 1943, plus obtained other British supplies through the Quartermaster system. In the period June 1942 to June 1944 the British supplied to US forces in England 63% of Quartermaster, 58% of engineer, 49% of medical, 25% of Chemical Warfare, 22% of signal corps and 21% of Air Force supplies, some 6.8 million measurement tons of supplies January 1942 to June 1944.
After an outcry the US banned shipments of alcohol to England, the British agreed to take over supply via the NAAFI, which had the bonus of taking the US Army out of the liquor business. This arrangement was changed when French liquor became available. The US banned ice cream in England until August 1944 since one was available for the civilians.
The European theatre had its own ideas about winter clothing and designed a garment based on the British Battle Dress, the Eisenhower jacket, orders for which were placed in the US in March 1944. This ran into the Army's desire to use the new model 1943 clothing. There was a debate about what items of the new 1943 uniform the theatre should use, the final orders were made on 1st June. The loose M1943 jacket became known as maternity jackets by the WACs.
A good measure of how good a particular item is can be found in how many enemy troops are captured wearing it.
The Armoured Force winter combat uniform was a prized item. The US tested new clothing designs at Anzio. Wet/cold weather clothing shipments to Italy were so delayed the 34th division did not receive any until January 1944 and resorted to taking such items from wounded sent to the rear to equip the troops. The result of the lack of clothing was a major rise in trench foot, 25% of US casualties in Italy in the 1943/44 winter. It was not widely realised that spending all day in damp shoes and socks in cool weather would cause trench foot. The ETO had its own ideas of winter clothing based on the British battle dress, the resultant garment was very highly prized but only officers received an issue before the end of the war. Nurses returning to the US had to fight to be allowed to wear their ETO uniforms, which were considered superior to home issue.