This Baby Romper and Bib set is ideal for baby to wear for Father's Day, or in fact for any time, and it's a great price too. The set was £9.99, but is now down to £4.99 at Argos.
These come in three sizes: Newborn, 0-3 months, and 3-6 months. They are made from 100%cotton, and the bib has a polycotton backing to prevent baby getting wet.
The above link will take you to the newborn size, and you can select the other sizes from the drop down box to be redirected to the correct item number.
The stocks vary with the different sizes, with the newborn size looking more hit and miss than the others in the area I have checked. If in doubt it's always better to get a bigger size, as they can always grow into it. Some babies are so big that they skip the newborn clothes size altogether and go straight to the 0-3 months (I'm looking at you son).
Reserve and collect is free, and home delivery will add another £3.95 to your order.
P.S. There's also an 'I Love Mummy' set*, if you're going for a new baby gift rather than a Father's Day one, and it's also reduced to £4.99.