Embroidery dimensions:

Caps to front max. height 5cm
  side max. width 8,5cm at 1,5cm height
    (or 6 x 6 cm)
  to back  max. width 8,5cm 
hats   max. height 4,5cm
T-shirts, tops, polo-shirts  (cannot be unbuttoned)  max. width 27cm 
Wind-cheaters, vests  (can be unbottened)  max. width 22-27cm, depending on the base
    (max. height 19cm) 
sleeve with knitwear    max. width 8,5cm 
sleeve without knitwear  (L, XL, XXL sizes)  max. width 12cm 
parts    max. dimension 37 x 17cm 
applique    max. dimension 40 x 34cm 
letters dimensions min. 3mm - applique 
    4mm - shirts, polo-shirts 
    5mm - T-shirts 
    5-6mm - caps and serif face