There are many companies now making clothes that work for children with additional needs, it can ease the stress out of uncomfortable, tight clothing or having to undo clothing. For example, to access a peg for gastro feed.
These back fastening coats are great.
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http://www.disabled-clothing.co.uk
Above are a few of the websites that supply specialist clothing for children additional needs. (We have not personally tried out any garments from these website supplier’s, so any purchases made are at your own discretion)