That makes waterproofs, footwear and hi-vis the three things worth spending properly on, with branding that survives being hosed down. Gloves and good socks come close behind, because cold, wet hands and feet slow a whole gang down.
Ankle deep from the first day
Groundworkers often stand in water at the bottom of a trench or on a saturated formation. Safety wellingtons keep feet dry where boots would flood. Look for a protective toe cap and a penetration-resistant midsole; S5 is the usual rating for all-rubber or polymer safety wellingtons under EN ISO 20345.
For mixed days, a waterproof S3 boot or the newer S7 rating handles puddles without the heat of a wellington. Check the site rules and your risk assessment.
Working around plant
Excavators, rollers and dumpers have blind spots, and groundworkers spend the day inside them. Hi-vis to EN ISO 20471 is essential, and many sites require class 2 or class 3 for operatives near moving plant. Check what the site sets.
Mud covers hi-vis quickly and makes it far less visible. Wash it often and replace it when it no longer looks bright, rather than waiting for it to tear.
Rain gear that keeps going
A groundworks gang cannot down tools every time it rains. Waterproof jackets and over trousers rated to EN 343 are worth the money. Hi-vis waterproofs combine both needs in one layer. Bib-style over trousers stay put better than waist versions when bending into a trench. Hang wet waterproofs to dry in the welfare cabin overnight, and give each operative a spare pair of gloves for the afternoon.
Concrete and cement
Wet concrete is alkaline and can cause serious burns if it gets inside boots or soaks through trousers and sits on the skin. Wellingtons worn with trousers over the top, not tucked in, stop concrete running into the boot. Waterproof gloves and a change of clothes in the van are sensible on pour days. Wash any splashes off skin straight away rather than waiting for the break.
Where to put your logo
On a groundworks job most of what is visible is hi-vis and waterproofs, so that is where your name goes. Print the company name across the back of hi-vis jackets and vests on the fluorescent area only, never on the reflective tape, and keep it compact so it does not reduce the compliant area. Print stands up to being hosed off. Save embroidery for the hoodies, fleeces and softshells worn by foremen and in the welfare cabin.