For groundcrew there are numerous permutations of clothing that will suit, the easiest in terms of acquisition of items is shown in the photos below.

In both photos, the airmen are wearing a standard issue wool pullover, these were used by the Bundesluftwaffe and are still available to buy from dealers.
The trousers are the service trousers or Fliegerhose. The man on the left is wearing ankle boots with gaiters, while the man on the right is wearing the so called jackboots.
Headgear is the side cap. Both men are undoubtedly wearing a ???????????

Schirmütze- Other ranks caps have coloured piping(Waffenfarbe) denoting arm of service, in this case flak.

Schirmütze with removable white summer cover. Without and with cap spring

Fliegermütze or Schiffsen

Einheitsfliegermütze 43

Waffenrock - in this case badged for Flak

Langhose- straight legged without a taper.

Tuchhose- straight legged with a slight taper so they would fit easily into boots.

Fliegerbluse - here with Other Ranks belt and a sleeve trade badge

Cuff title for Other Ranks, embroidered in silver grey cotton thread, note the variation with Geschwader rather than Jagdgeschwader. (Genuine example shown)

The following items of uniform are acceptable :-

Some pictures will link you to the Details page for that Item, giving more in depth advice and images. Also it may indicate possible sources of the more accurate replicas. See also the Links page. Best advice is buyer beware or for provisional and existing members, use the Contact Us page. Use the links at your own discretion, we will not be held responsible for any transaction issues !

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Groundcrewman overalls, this image is of the lined variety (winter weight) made from cotton herringbone pattern material. Usually black but also in a dark blue as here.